Katie needed to take out three loans. a) first, she paid $596.24 in interest on a nine-month loan for which the rate was 11%. how much money did she borrow? b) a year later, katie borrowed $10,000 for three months. if she paid $225 in interest, what rate of interest did she pay? c) finally, katie borrowed $12,000 at 10% interest. if she paid $600 in interest, for how long was the loan?

Now.. for a) and b) parts

keep in mind for the equation " i = Prt " the "t" stand for years
a) has 9months, 9 months from 12 months is 3/4 of a year
b) has 3 months, and that's just 1/4 of a year

a)



solve for P

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b)



solve for "r"
now, you'd get a decimal amount, as you notice in the first one, rate in % is just whatever/100, so, to get the % figure, simply multiply it by 100

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c)



solve for "t"