A consulting group surveyed General Mills, Inc. employees to research the factors that affect their satisfaction with their quality of life. A special index, called the index of satisfaction, was used to measure satisfaction. Six factors were studied: age at the time of first marriage (X₁), annual income (X₂), number of children living (X₃), value of all assets (X₄), status of health in the form of an index (X₅), and the average number of social activities per weekâ€"such as bowling and dancing (X₆). Suppose the multiple regression equation is:

What is the estimated index of satisfaction for a person who first married at 18, has an annual income of $26,500, has three children living, has assets of $156,000, has an index of health status of 141, and has 2.5 social activities a week on the average? (Round your answer to 3 decimal places.)

Which values would add more to satisfaction, an additional income of $10,000 a year or two more social activities a week? (Round your answers to 1 decimal place.)