Let’s solve step by step using unit cost.
Step 1: Cost price per mango
1st variety: 4 for ₹10 ⇒ ₹10/4 = ₹2.50 each
2nd variety: 5 for ₹12 ⇒ ₹12/5 = ₹2.40 each
3rd variety: 2 for ₹5 ⇒ ₹5/2 = ₹2.50 each
Step 2: Mixing ratio = 2 : 3 : 1
Assume total mangoes = 6 units:
1st = 2 units
2nd = 3 units
3rd = 1 unit
Step 3: Total cost price
CP=(2×2.5)+(3×2.4)+(1×2.5)
=5+7.2+2.5=14.7
So CP = ₹14.7 for 6 mangoes
Step 4: Selling price
Selling rate = 3 for ₹7
So for 6 mangoes:
SP=36×7=14
Step 5: Profit/Loss
Loss = 14.7 - 14 = 0.7
Step 6: Loss percentage
14.70.7×100≈4.76%