Please help me to find the T test,Critical value and p value of the following

Variable

All Sample

(n=166)

Noncontract Farmers

(n=96)

Contract Farmers

(n= 70)

Mean differences

1.Average variable costs(VND/Kg)

2,479

2,519

2,423

-95.49*

2.Unit selling price (VND/kg)

5,220

5,202

5,244

42.02

3.Unit return (VND/kg) (2) - (1)

2,733

2,683

2,821

137.70*

4.Average rate of return (3)/(1)

1.14

1.09

1.22

0.13**

Thank you