# Calculus

posted by
**Marilyn**
.

How would i start this problem?

The amount that workers contribute monthly for health care insurance premiums can be modeled by A(t)=0.07t^3-3.1t^2 + 54.3t-230, where A is the monthly amount contributed and t is the number of years after 1980. Find the instantaneous rate of change in monthly contribution in 2000.