Aworker gets a raise of $120 per month and quickly decides to spend $90 of the money on necessities and the occasional luxury, while putting the remaining $30 into retirement savings. based on this decision, calculate the worker’s marginal propensity to consume, or mpc, as a decimal. type an answer and press enter to submit

An allergy products superstore buys 6000 of their most popular model of air filters each year. the price of the air filters is $18. the cost of ordering and receiving shipments is $12 per order. accounting estimates annual carrying costs are 20% of the price. the supplier lead time is 2 days. the store operates 240 days per year. each order is received from the supplier in a single delivery. there are no quantity discounts. what is the store’s minimum total annual cost of placing orders & carrying inventory?