since its not compounded this is a very simple problem.
r= interest rate
x= principle
y=years
Interest Accumulated = x*y*r
so, in your case:
2500 = 10000 * 5 * r
2500 = 50000r
divide both sides by 2500
and you get: r=.05 (or 5%)
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simple interest .. A = P(1+r)t 10000 = P(1.05)5 P = 10000 / (1.05)5 P = 7835.26
To calculate the interest gained on something, a simple formula is used. Initial value x (percentage increase as a decimal)^years So: 10000 x 1.05^15 = 20789.28 (2d.p).
The monthly interest is 100.
I'll do it both ways since you do not specify whether it is simple of compound interest. FV = P + PRT 10000 = P + P(.03)(20) 10000 = P(1 + 0.60) 10000 = 1.6P 6250 = P Check 6250 * .03 * 20 = 3750 + 6250 = 10000 ◄ FV = P + P(1+R)T 10000 = P + P(1.03)20 10000 = P + P(1.80611) 10000 = 2.80611*P 3563.65 = P Check 3563.25 + 3563.25(1.03)20 3563.25 + 3563.25*1.80611 3563.25 + 6436.35 9999.70 (Rounding error) ◄
1000 mcg = 1 mg so 10000 mcg = 10000/1000 = 10 mg. Simple!