$5\mathrm{.}10$ Compute the future value of $$1,900$ continuously compounded for

a$.7$ years at a stated annual interest rate of $12$ percent.

b$.5$ years at a stated annual interest rate of $10$ percent.

c$.12$ years at a stated annual interest rate of $5$ percent.

d$.10$ years at a stated annual interest rate of $7$ percent.