HELP WITH ALBRA PLZZZ?

Donna of DONna 's delights is gearing up for her hallween sales blitz. she has some white chocolate ghosts that sells for $5.10 per Lb. and some dark chocolate bats that sell for $7.50 per LB. she wants to mix them to create 200 lbs. of holiday mix that sells for $6.00 per lb. how many pounds of each should she use to create the mix?? PLZZ HELP