In the formula i=p.rt, what does r stand for?
a. rate: the percent that interest is paid annually as a decimal
b. ratio: the size of the interest interval compared to time
return: how much money you end up earning
d. reserves: how much money you have in the investment
c.
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a. Rate: the percent that interest is paid annually as a decimal.                                                                                                                                                                                                explanation:In the given formula  of simple interest I = P.r.t

P is the principal or initial amount.

r is the rate of interest paid annually as a decimal.

t is the time period in years.

The simple interest formula permits us to calculate I, which is the interest charged or earned on a loan.

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