The Given Marginal Function Has X Measured in Years and MR(x)

Multiple Choice

The given marginal function has x measured in years and MR(x) in hundreds of dollars per year. Use numerical integration on a graphing calculator to find the total revenue over the given period.
- $\operatorname{MR}(x) =0.24 x^{4}-6.25 x^{3}+30.7 x^{2}+87.6 x \quad(0 \leq x \leq 6)$

A) $\$ 2135.45$
B) $\$ 5931.80$
C) $\$ 213,544.80$
D) $\$ 55,864.80$