Thapelo's Tuck Shop had these balances on 31 December: Sales P60 000; Purchases P35 000; Opening stock P5 000; Closing stock P8 000; Rent P6 000; Wages P9 000.

1. aCalculate cost of sales. [2]
2. bCalculate gross profit. [1]
3. cCalculate net profit. [2]

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