Hell I don’t like maths and I don’t understand. It’s multiple choice

Which equation represents the partial sum of the geometric series?

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

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500