Jasmine allows 4% discount on the marked price of her goods and still earns a profit of 20%. What is the cost price of a shirt if its marked price is 850?
Marked price = 850
Discount % = 4%
=> Discounted amount = $$\frac{4}{850}$$ * 100 = 34
=> S.P. = 850-34 = 816
Profit % = 20%
Let C.P. = $$x$$
=> $$\frac{816-x}{x}$$ * 100 = 20
=> $$6x = 4080 => x = 680$$
C.P. = 680
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