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subhasis samal
Roxy buys 200 t-shirts at $99.70, another 300 at $100.10, another at $100.50. Then as the interest rate goes up he finds the price of t-shirts beginning to fall and settled at $99.95.How many should he buy at a price so that his Avg cost is $100 per t-shirt?
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Average cost = (200*99.70) + (300*100.10) + (400*100.50) + (x*99.95) = 100*(200+300+400+x)

Solve this equation to get an answer.

This question is very ambiguous and not properly written.