Mariah went to the grocery store and purchased m cartons of milk and s bags of sugar. The milk was $2.39 per carton and the sugar was $1.99 per bag. She also purchased c candy bars for $2.35 each. On the way out of the store she donated $4 to a local charity. Evaluate the following expression to determine how much Mariah spent at the grocery store:

2m + s + 3c + 4

Explain how to evaluate the expression and determine how much money Mariah spen