Suppose that x number of the unit be produced and sold.
As each unit’s variable cost is 25% of revenue
The variable cost of x units = 25 % of ₹ 8x = ₹ 2x
Total cost of producing x units C(x) = TFC + TVC = ₹(24000 + 2x)
Price of one unit = ₹ 8
Total revenue of selling x units = R(x) = ₹ 8x
At break-even values,
C(x) = R(x)
⇒ 24000 + 2x = 8x
⇒ 24000 = 6x
⇒ x = 4000