Solve the Problem $\$ 4,000$ Is Put Aside in a Money Market Account with Interest

Solve the problem.
-If $\$ 4,000$ is put aside in a money market account with interest compounded continuously at $3.1 \%$ , find the time required for the account to earn $\$ 1000$ . Round to the nearest month.

A) $7 \mathrm { yr } , 10$ months
B) $5 \mathrm { yr } , 11$ months
C) $8 \mathrm { yr } , 2$ months
D) $7 \mathrm { yr } , 2 \mathrm { months }$