Electronics Sales (1990s) Annual U.S. factory sales of consumer electronics goods to...

Electronics Sales (1990s) Annual U.S. factory sales of consumer electronics goods to dealers from 1990 through 2001 can be modeled as

where output is measured in billion dollars and t is the number of years since 1990.

(Sources: Based on data from Statistical Abstract, 2001; and Consumer Electronics Association)

a. Numerically estimate to the nearest tenth the derivative of s when t = 10.

b. Interpret the answer to part a.