You have collected the following data on output and total variable costs:

Q	TVC ($)
10	5,830
20	9,840
30	12,810
40	15,520
50	18,750
60	23,280
70	29,890
80	39,360
90	52,470
100	70,000

1. Identify the range of output exhibiting increasing returns (increasing MP), and the range exhibiting diminishing returns (decreasing MP).