Solve the Problem $B(x)$ Of a Dollar $x$ Years from Now Will Decrease According to the Formula

Multiple Choice

Solve the problem.
-An economist predicts that the buying power $B(x)$ of a dollar $x$ years from now will decrease according to the formula $\mathrm{B}(\mathrm{x}) =0.42^{\mathrm{x}}$ . How much will today's dollar be worth in 5 years? Round the answer to the nearest cent.

A) \$ 1.97
B) $\$ 0.65$
C) $\$ 2.10$
D) $\$ 0.01$