The correct answer would be, monthly cost of eating at restaurants.
Monthly cost of eating at restaurants is a variable expense for most adults.
Explanation:
Adults are people over the age of 18. At this age, people are considered mature, self sufficient, confident, independent, and responsible.
Variable expense is the expense which vary with the increase or decrease of the usage of something. For example, Mobile Phone expense increase or decrease with the use of this service.
Similarly eating at restaurants is a variable expense, because it varies with the amount or frequency of eating out. If people dine out more, their variable expense is likely to increase, and vice versa.
On the other hand, some are fixed expenses like rent, insurance, etc.
Learn more about Fixed and Variable Expense at:
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