1. 16 dozen times at Rs. 18.50 each
  2. 170 packets at Rs. 21.50 each
  3. 12 dozen items at Rs. 25.00 each
  4. 220 packets at Rs. 16.50 each
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1 Answers

Option 1 : 16 dozen times at Rs. 18.50 each

Calculation:  

Option:1   

1 dozen = 12 items

⇒ 16 dozen = 16 × 12 = 192 items

Cost of each item = Rs.18.50

⇒ Cost of 192 items = 18.50 × 192 = Rs.3,552

Option: 2

Cost of 1 packet = Rs. 21.50

⇒ Cost of 170 packets = 21.50 × 170 = Rs.3,655

Option:3

1 dozen = 12 items

⇒ 12 dozen = 12 × 12 = 144 items

Cost of each item = Rs. 25

⇒ Cost of 144 items = 25 × 144 = Rs. 3,600

Option:4

Cost of 1 packet = Rs.16.50

⇒ Cost of 220 packets = 16.50 × 220 = Rs. 3,630

∴ She should spend the least amount by choosing option 1

The correct option is 1 i.e. 16 dozen times at Rs. 18.50 each        

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