A toy tractor sold for $292 in 1980 and was sold again in 1987 for $415. Assume that the growth in the value V of the collector's item was exponential.

d) What is the doubling time for the value of the toy tractor to the nearest tenth of a year?

answer in years (Round to the nearest tenth.)

A toy tractor sold for \$292 in 1980 and was sold again in 1987 for $415. Assume that the growth in the value V of the collector's item was exponential. a) Find the value k of the exponential growth rate. Assume V0=292. k=0.050 (Round to the nearest thousandth.) b) Find the exponential growth function in terms of t, where t is the number of years since 1980 . V(t)= c) Estimate the value of the toy tractor in 2010 . (Round to the nearest dollar.) d) What is the doubling time for the value of the toy tractor to the nearest tenth of a year? years (Round to the nearest tenth.)