Jack is learning to play piano. he knows that a piano has 88 keys and that there are 12 unique keys in each group called octave. how many complete octaves are on a piano?

Jake bakes and sell apple pies. he sells each pie for $5.75 . the materials to make the pies cost $40. the boxes jake puts the pies in cost & 12.50 total. how many pies does jake need to sell to earn a profit of $50