The area of a trapezoid is calculated using the formula below, where a is the area of the trapezoid, b1 and b2 are the bases of the trapezoid, and h is the height of the trapezoid. rewrite the formula to find the base b2.

Formula

 Multiply both sides by 2

2*Area = (b1 + b2)*h                  divide by h

  Subtract b1 from both sides

This can be written as  

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)

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step-by-step explanation: