Answer:
Cost of a candy bar in a week = $6.45
Cost of the candy bar in a month = $25.8
Cost of the candy bar in a year = $309.6
Explanations:Price of a candy bar = $1.29
Number of days from Monday to Friday = 5
Cost of the candy bar in a week = (1.29 x 5)
Cost of a candy bar in a week = $6.45
Cost of the candy bar in a month
There are 4 weeks in a month
Since he buys a candy bar 5 days in a week
Number of candy bars bought in one month = (5 x 4) = 20
Cost of the candy bar in a month = 20 x 1.29
Cost of the candy bar in a month = $25.8
Cost of the candy bar in a year
There are 12 months in a year
Cost of the candy bar in a year = (cost of the candy bar in a month) x 12
Cost of the candy bar in a year = 25.8 x 12
Cost of the candy bar in a year = $309.6