20-07-2014
Mathematics

Answered

Walt made an extra $7000 last year from a part-time job. He invested part of the money at 10% and the rest at 7%. He made a total of $580 in interest. How much was invested at 7%?Select one:

Answer :

trinacheemalap trinacheemalap

21-07-2014

We know that
Interest= PNR/ 100.
where P is the principal
R is the rate of Interest
N is the no of years the sum has been invested for.
Since N is not given we assume that to be 1
Therefore we have
10x /100 + (7000 -x)*7/100= 580

Multiplying both sides by 100
10x+(7000-x)*7 = 58000
simplifying
10x+ 49000 - 7x = 58000
3x = 58000-49000
3x = 9000
x= 3000
therefore the sum of money invested at 7% = 7000 - 3000 = 4000

Answer Link

Other Questions

Write the reaction for the dissolution of \(\text{CaBr}_2\) in water.[tex]\[ \text{CaBr}_2 (s) \rightarrow \text{Ca}^{2+} (aq) + 2\text{Br}^{-} (aq) \][/tex]

When an insurer issues a policy that refuses to cover certain risks, this is referred to as a(n):A. eliminationB. exclusionC. limitationD. exception

)What will be the output shape of the following Python code? from turtle import * turtle=Turtle() screen=Screen() for i in range(4): turtle.forward(60) turtle.l

Select the correct answer.Simplify the expression using properties of exponents.[tex]\[ \frac{25 a^{-5} b^{-1}}{5 a^4 b} \][/tex]A. \( 5 a b^7 \)B. \( 5 a^9 b^9

A quadratic equation is written as a system of two quadratic functions. Select the number of possible ways the graphs can intersect. a. 0 b. 1 c. 2 d. infinite

Select the correct answer.Two points located on [tex] \overleftrightarrow{ JK } [/tex] are [tex] J(1,-4) [/tex] and [tex] K(-2,8) [/tex]. What is the slope of [

SIMPLE PRESENT GRAMMAR PRACTICE Write the he, she, it form of the following verbs.a. buy b. come c. cry d. dance e. do f. drink g. eat h. finish i. fl

Which of the following is a biological component of sexuality?A. Gonadal sexualityB. Gender preferenceC. Gender identityD. Gender adoption

Identify the type of historical source based on the information provided.A history student is asked to make a video based on the research that he or she is doin

28. A civil engineer would be called upon to evaluate which of the following?A. If the ground has sufficient load-bearing capacityB. If additional blocking, mat

The school concert raised $1360 from the sale of 400 tickets. If adult tickets cost $5 and student tickets $3, how many student tickets were sold?How many stude

There were 75 rocks is Boxes A,B, and C. After moving 28 rocks fro Box A to B, 24 rocks from B to C, and 19 rocks from C to A,there was an equal number of rocks

Sacha has 4 quarters in her pocket.she has 6 timés as many quarters in her piggy Bank. Draw a picture to show thenumber of quarters sacha has in her piggy Bank.

Mary is making a pinata that has a ball-like shape. The pinata has a surface area of 40 feet. Use the formula for the surface area of a sphere: (S=4πr^2) to fin

What do epidermis and the dermis have in common? Could you please help me with me questions?

The radius of a bicycle wheel is 12 in. What is the approximate circumference of the wheel?

A candy distributor needs to mix a 10% fat-content chocolate with a 40% fat-content chocolate to create 100 kilograms of a 16% fat-content chocolate. How many k

A pea plant is heterozygous for height (Tt). Which allele will be carried by a pollen grain produced by the plant? A.T only B.t only C.T and t D.T or t

Name two things found in a plant cell that are not found in an animal cell.

Two ships leave whittier, Ak at 7 AM. The first ship sails towards Valdez on a 54° course at a constant rate of 36 mi/h. The second ship sails towards Knight is