Suppose that register B contains a two-decimal-digit BCD number n. Write a subroutine called CONVERT that replaces the content of register B with its binary equivalent. The content of the other registers (except the program counter) should be unchanged at the completion of the subroutine. Memory locations $1A, $1B, and $1C can be used for temporary storage. [Hint: We need to separate the upper nibble (four bits) of n from its lower nibble. This can be achieved by shifting n four bits to the left, with the result appearing in the D register. Shifting by four bits to the left is accomplished by multiplying by 2⁴.]