A salesman is allowed `5 1/2`% discount on the total sales made by him plus a bonus of `1/2`% on the sales over
Rs.10,000. If his total earnings were Rs. 1990, then his total sales (in Rs.) were:
Let the total sales be Rs. `x`. Then, `5 1/2`% of `x + 1/2`% of (`x` - 10000) = 1990
`hArr 11/2 xx 1/100 xx x + 1/2 xx 1/100 xx (x - 10000)` = 1990
`hArr 12x - 10000 = 398000 hArr 12x = 408000 hArr x` = 34000.
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