Answer:
labor input pairs of jeans marginal physical value of marginal
per day product physical product
0 0 0 0
1 10 10 $300
2 36 26 $780
3 56 20 $600
4 68 12 $360
5 74 6 $180
6 76 2 $60
7 76 0 0
8 74 -2 -$60
The marginal revenue product is the value of marginal physical product, and you calculate it by multiplying marginal physical product times the unit price of the pair of jeans.