question 1000=20(1/0.015 - 1/0.015(1.016)t(power of t)
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1000 = 1333.33 - 66.67/(1.06)t
66.67/(1.016)t= 1333.33-1000

66.67= 333.33(1.016)t

0.2 =(1.016)t where d