I need the slope of 3.66 and 4.49

In a sumif conditional function, what should be the order of terms in the parentheses?

Bridge building company estimates that it will incur $1,200,000 in overhead costs for the year. additionally, the company estimates 50,000 direct labor hours will be spent building custom walking bridges for the year at a total direct labor cost of $600,000. what is the predetermined overhead rate for bridge building company if direct labor costs are to be used as an allocation base?

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends > a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?