Managers of a grocery store chain are researching use of weekly discount coupons and purchase of pet supplies. They determined that 16% of their customers used coupons and bought pet supplies, but 24% of their customers used coupons but did not buy pet supplies. During the study, they found 40% of their customers bought pet supplies in their purchase.What is the probability a customer did not use discount coupons and did not buy pet supplies in their purchase?