A tailor stitches 8 shirts everyday. It takes him 2 hours to stitch a shirt. Each shirt uses 6 buttons and has two pockets. Each shirt costs the tailor $ 2 and he charges the customer $ 4. 1. How many pockets does the tailor stitch in 31 days?   2. How many buttons does the tailor use in 4 days?   3. How many dollars does the tailor collect from his customers in 5 days?   4. How many dollars does the tailor earn as profit in 18 days?   5. How many hours does the tailor work in 3 days?