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This is a Proportion question. 

First shirt

100u = 35

90u = 90/100 × 35 = 31.50

Second shirt

100u = 35 + 78.75 = 113.75

77 – 31.50 = 45.50

(113.75 – 45.5)/ 113.75 × 100% = 60% discount 

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