Hey Shirley

Following pls find my worked solution:

For 150 teddy bears given free, this also infers that 150 customers bought 2 teddy bears each. I.e. 300 teddy bears sold.

From these 450 teddy bears,

Amt earned (Profit): 300 × 5 = 1500

Amt loss (Loss): 150 × 3 = 450

Net Amt earned (Net Profit) = 1500 - 450 = 1050

Given that Mindy had $1215 left after paying Factory ABC,

Overall Amt earned (Overall Profit) = 1215

But Net Profit (from customers paying 2 teddy bears) = 1050.

Hence, Net Profit (from customers paying 1 teddy bear) = 1215 - 1050

= 165

Number of Customers (paying 1 teddy bear each)

= 165 ÷ 5

= **33**

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Trust this helps.

Do let me know again if this is different from your Answerkey or if there's further clarification.

Cheers,

Edward