Answer:
It will cost him $13.10 to send 4 small packages and 1 large package.
Explanation:
1. Cost of sending 4 small packages = 4 * $2.5 = 4 * $2.50 = $10
2. Cost of sending 1 large package = 1 * 3.1 = $3.1
Total cost of sending 4 small and 1 large packages = $10 + $3.10 = $13.10