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 Math Central Quandaries & Queries
 Question from Tash, a student: The amount of money in a single year of an investment after P dollars were initially invested is A = P + Prt, where r is the rate of simple interest. What expression describes P? How much money was initially invested if the account has $\$1000$one year after the initial investment and the interest rate was 5%? Hi Tash, Notice that on the right side of$A = P + Prt$there is a common factor of$P.$Pull out this common factor and then solve for$P.$This will result in an expression for$P.$For your second question$A = \$1000, t = 1$ (I assume $t$ is in years) and the interest rate $r = 5\% = 0.05.$ Solve for $P.$

Penny

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