4 x’s for 1/4
2 x’s for 2/4
1 x for 3/4
2 x’s for 1

In case there is no double entry system is followed, profit can be calculated by comparing the opening and closing capital. In the given situation this can be calculated as:
Opening Capital Rs.200000
Add: Capital Introduced Rs.200000
Add: Profit for the year Rs. 250000
Less: Loss for the year Rs.NIL
Less: Drawings Rs. 30000
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Capital at the end of the year Rs.620000
-------------------
Loan taken is a liability and loan given is asset, that will not affect the capital.
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So far, you've only defined f(x). You haven't asked a question.
5(2x-7)
Hope this helps !
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