By selling 90 pens for Rs 80 a man loses 20%. What should be the selling price (in Rs) of 90 pens for 20% profit?
Selling price = Rs. 80
Loss % = 20%
=> Cost price = $$80\times\frac{100}{(100-20)}=Rs.$$ $$100$$
Profit % = 20%
$$\therefore$$ Selling price = $$100\times\frac{(100+20)}{100}=Rs.$$ $$120$$
=> Ans - (D)
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