It means that the interest is paid out every three months (quarter year). That means that the interest paid out after 3 months is earning interest for the remaining nine months. The quarterly interest rate is such that this compounding is taken into account for the "headline" annual rate. As a result, if the quarterly interest is taken out, then the total interest earned in a year will be slightly less than the quoted annual rate.
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Since the annual interest rate is given, the fact that the interest is calculated and compounded quarterly is not relevant. The interest is 750000*2.5/100 = 18750 pesos.
8 percent compounded quarterly is equivalent to approx 36% annually. At that rate, after 3 years the ending balance would be 1762.72 approx.
It will take 19 years.
750 invested for 10 years at 10% pa would be 1,945
74 or 75 years