Question

The equation A=p+prt is ued to find the accumulated amount, A, of an investment with principle, P, a certain interest rate, r, and over time, t. What is the value for r, after the equation is rearranged?

A. r= A+p/ pt
B. r= A-p/ pt
C. r= A-1/ t
D. r= A-p-pt

Answer 1

B. r = A-p/pt

Explanation:

We can rearrange the equation to make
`r` the subject of the equation:

`A=p+prt`

`A-p = p+prt-p`

`A-p = prt`

`(A-p)/(pt) = (prt)/(pt)`

`r = (A-p)/(pt)`

∴ Option B is correct

Hope this helps :)