By selling 90 ball pens for 160 rupees a person loses 20% . how many ball pens should be sold it for 96 rupees so as to have a profit of 20%
Requirements:
By selling 90 ball pens for 160 rupees a person loses 20% . how many ball pens should be sold it for 96 rupees so as to have a profit of 20%
Requirements:
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