Find the total output of a coalmine, if after 24% wastage

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Find the total output of a coalmine, if after 24% wastage the net output is 68,400 tonnes.

1. 95000 tonnes
2. 85000 tonnes
3. 90000 tonnes
4. None of these

Correct Option: C

Let the total output be x tonnes.
Then, net output

= x -	24	× x =	76x
	100		100

⇒	76	= 68,400
	100

⇒ x =	68,400 × 100	= 90,000 tonnes.
	76