Earnings by selling 1 kg Maida = Selling price - Cost price
= ₹42 -₹40 = ₹2
For 2 kg maida, earnings = ₹2 x 2 = ₹4
Earnings by selling 1 kg flour = ₹50 - ₹45 = ₹5
For 4 kg flour, earnings = ₹5 x 4 = ₹ 20
Earnings by selling 1 kg sugar = ₹38 - ₹35 = ₹3
For 3 kg sugar, earnings = ₹3 x 3 = ₹9
Total earnings = ₹4 + ₹20 + ₹9 = ₹33