Mark is saving for his son's college education. If the savings account earns 9% interest compounded quarterly, and he wants to have $80,000 in 18 years, what must the principal be?

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I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.