ColeYellvballiss ColeYellvballiss 03-11-2016 Mathematics contestada The simple interest formula I=prt gives the interest earned on an investment of p dollars at interest rate r for a time of t years. How much does Leroy need to invest at a rate of 7% in order to earn $420 interest in 4 years? $150 $2,400 $240 $1,500