Can someone explain thoroughly the variable expenses

Before you begin to compose a message, you should conduct research to collect the necessary information. to avoid frustration and inaccurate messages, be sure to consider the receiver's position. which questions should you ask yourself before determining what and how to research?

If a bond is issued at a premium the effective interest rate is most likely

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?