Mathematics

Bear

11 October, 13:54

The country A Consumer Price Index is approximated by the following formula, where t represents the number of years after 1990.

a (t) = 100e^0.023t

For instance, since A (16) is about 144 , the amount of goods that could be purchased for $100 in 1990 cost about $144 in 2006. Use the function to determine the year during which costs will be 90 % higher than in 1990.