help solve pls

Oliver manages an online retailer that makes and sells two kinds of speakers, the Master Blaster and the Rocker. Each Master Blaster takes 4 hours to create the plastic parts, 7 hours to create the electronics, and 2 hours for assembly. Each Rocker requires 8 hours to create the plastic parts, 4 hours to create the electronics, and 9 hours for assembly. The factory can handle a maximimum of 2940 hours to create the plastic parts, 4375 hours to create the electronics, and 2295 hours for assembly each week. If each Master Blaster generates $5 in income, and each Rocker generates $13, how many of each of the speakers should Oliver have the online retailer make and sell each week to earn the most income? Master Blaster: Rocker: Best income