find the rate of discount if a dress marked price at rupees 400 is sold for Rs 370
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MP = Rs. 400
SP = Rs. 370
SP= d ÷ 100 ×MP
=> 370 = (d ÷ 100 )× 400
=> 370 ÷ 400 = d ÷ 100
=> (37 ÷ 40) × 100 = d
=> 37 × 5 ÷ 2 = d
=> 185 ÷ 2 = d
SP = Rs. 370
SP= d ÷ 100 ×MP
=> 370 = (d ÷ 100 )× 400
=> 370 ÷ 400 = d ÷ 100
=> (37 ÷ 40) × 100 = d
=> 37 × 5 ÷ 2 = d
=> 185 ÷ 2 = d
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