Please help me with this math post test!

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Aking and his army will attempt to capture a fortress. the left and right flanks break off from the main group to attack the west and east guard towers. suppose the left flank has a 60% chance of success and the right flank has a 75% chance of success, independently of one another. if both flanks capture their respective targets, then the king has a 98% chance of successfully taking the fort. if, however, only the left flank captures its tower, the king has an 80% chance of success; if only the right flank succeeds, the king has a 50% chance. if both flanks fail, then the king's chance of capturing the fort drops to 20%. it turns out the king captures the fort. what is the probability that one, and only one, flank was successful (either the left, or the right, but not both)? (round your answer to 3 decimal places)

Dawit was earning $100 per week in january. he got a raise of 10% in march, but then a 10% reduction after changing jobs in august, was dawits weekly pay after august higher, lower, or the same as it was in january?