Question 50096
An investment of P dollars made at the simple interest rate r for t years will grow to a total T=P+Prt. For an investment of $10,000 to grow at least $12,000 in two years, what is the minnimum interest rate at which it can be invested? 
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T=P+Prt
12000= 10000+10000(r)(2)
2000=20000r
r=0.10= 10%

Cheers,
Stan H.