A grocer bought 100 pounds of mushrooms at 69¢ per pound. Experience indicates that, as a result of aging, 30% of the mushrooms are sold at cost and another 20% are discarded. Find the original marked price that will produce a 25% markup on cost.
30 lbs sold at .69/lb yields 20.70
20 discarded, so 0.00
50 lbs sold at $x/lb so that
20.70 + 50x = 100*.69*1.25
x = $1.31
so he sold them for $1.31/lb