<PRE><B>Question 979323</B>
When the amount of (p) is invested at the annual interest rate (r) compounded for (t) years, it will grow to an amount (a) given by the formula
A=P (1+r)^t

1find the interest rate if php 30,000 compounded annually grows to php 33,765 in four years?
33765 = 10000*(1+r)^4
(1+r)^4 = 3.3765
{{{1+r = root(4,3.3765)}}}
1+r =~ 1.35555
r = 0.3555 = 35.55% per year
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2 find the interest rate if php 50,000  compounded annually grows to php 55,204 in five years?
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Same problem, different numbers.
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