T=I/Pr
t:500/(4000*0.025)
t: 5 yrs
Dear Random17, the question to your answer requires the use of the formula I=Prt. The equation will look like 500=4000(0.025)t. Multiply 4000 times 0.025 to get 500=10t. T=50 years.
It would be the points (0,80) and (15,10)
Divide 5,000 to 100 and u will get your answer