Its 100 because its not rounded to the nearest whole like 200 because its less than 50 so it would round down
12 pack of pens for $1.09
m packs = 1.09*m = 1.09m
1 composition book = $2.79
n composition books = 2.79*n = 2.79n
Total cost = (1.09m + 2.79n)
Since there is a discount of 5%, the net price would be: 100% - 5% = 95%
Net Cost = 0.95*(1.09m + 2.79n)
Cindy's bill = $ 0.95*(1.09m + 2.79n)