Question 816321
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Hi,
A man intends to invest $1,000 at simple interest. 
Solve the formula A = p + prt for t  {{{t = (A - P)/Pr}}}
find how long it will take to double his money(A = 2P), at the rates of 5%, 7%, and 10%.
{{{t = (2P-P)/Pr = 1/r =  1/.05}}} 
{{{t = (2P-P)/Pr = 1/r = 1/.07}}}
{{{t = (2P-P)/Pr = 1/r =  1/.10}}}