Julie wants to make 800g of a 15% alcohol solution by mixing 20% solution and a 4% solution. how many grams of each kind does she need? if a 20% and a 4% alcohol solution weigh x g and y g respectively solve with equation and show steps you ; )

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60