Question

Solve the formula for a

Answer 1

Answer:

Given formula:

• $S = a(1-r^n)/(1-r)$

Solving for a:

• $S(1-r) = a(1-r^n)$
• $a = S(1-r)/(1-r^n)$

Answer 2

$\\ \tt\longmapsto S=\dfrac{a(1-r^n)}{1-r}$

• Use cross multiplication

$\\ \tt\longmapsto S(1-r)=a(1-r^n)$

$\\ \tt\longmapsto a=\dfrac{S(1-r)}{1-r^n}$