An alloy of copper is 10% copper and weighs 25 pounds. a second alloy is 18% copper. how much (to the nearest lb.) of the second alloy must be added to the first alloy to get a 13% mixture.

Asalesperson set a goal to earn $2,500 in august. she receives a base salary of $1,000 per month as well as a 20% commission for all sales in that month. how many dollars of merchandise will she have to sell to meet her goal?