The bill for lunch was $28.95 before tax the tip was 20% based on the pre tax amount. How much money did they leave as a tip?

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