What categories are the same percentage of the budget?

category amount spent per month

housing $1,302

taxes $1,550

food $558

clothing $124

entertainment $124

transportation $372

college savings $558

retirement savings $558

gasoline $248

emergency savings $310

utilities $496

a. housing and taxes

b. transportation and emergency savings

c. food, college savings, retirement savings

d. food and gasoline

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.