Question 1028380
simple intrest assumes no compounding.


the formula is i = p * r * n


i = interest
p is the principal
r is the interest rate per time period.
n is the number of time periods.


your annual intrest rate is 5.25% = .0525.
your number of years is 4.
your interest is 252.


the formula becomes 252 = p * .0525 * 4 


divide both sidesof this equation by (.0525 * 4) and you get:


252 / (.0525 * 3) = p


solve for p to get p = 1200.


you invested 1200 at .0525 interest rate per year for 4 years.


.0525 * 1200 = 63 * 4 = 252.


solution looks good.


original investment is 1200.