Question

The formula A=p+prt, gives the amount, A, in an account when p dollars are invested at a rate of simple interests, r, for t years. Solve this formula for t.

Answer 1

A=p + p.r.t , 

A - p = p.r.t
Divide both sides by p.r
(A-p)/p.r = (p.r.t)/p.r

 (A-p)/pr = t or t= (A-p)/pr