Write a c$++$ program to compute the cost of sweet treats.

Ask the user to input a character to determine whether the treat is a muffin or a donut. The user will input $M$ for a muffin and D for a donut. If the user inputs any other character, print an error message.

If the character is $M$ or $D$ : Ask the user to input an integer indicating the number of donuts or muffins. compute the total cost of muffins or donuts.

Additionally, if the number of donuts or muffins is $12$ or More; determine the number of boxes needed to hold the treats. Each box can hold one dozen $(1$ dozen $=12)$ treats.

For example, if the input is $M$ and number of muffins is $15,$ then total cost: $15**5=75$ Dhs$.$ Number of boxes needed for $15$ muffins is $2.$