Which one of the following costs the least ?
750 packets of Rs. 7.50 each packet
Total cost = number of units × price per unit. A dozen means 12 items, so dozens must first be converted into items before multiplying.
Step 1 — 75 packets at Rs. 750 each cost 75 × 750 = Rs. 56,250.
Step 2 — 750 packets at Rs. 7.50 each cost 750 × 7.50 = Rs. 5,625.
Step 3 — 7.5 dozen = 90 items; at Rs. 750 each they cost 90 × 750 = Rs. 67,500.
Step 4 — 75 dozen = 900 items; at Rs. 7.50 each they cost 900 × 7.50 = Rs. 6,750.
The smallest of Rs. 56,250, Rs. 5,625, Rs. 67,500 and Rs. 6,750 is Rs. 5,625.
750 packets of Rs. 7.50 each packet option is correct.
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