It takes sami 10 minute to shovel the snow 20 m2 area. he charges 5 dollars for half an hour . how much will he charge to shovel the snow of a sidewalk that has a dimensions of 2m x 40m.

First, we need to find the area of the sidewalk that he will be shoveling:


In this case, l=2m and w=40m. Then we have


We know that he can shovel in 10 minutes, so this would take him 40 minutes since 20*4=80. Now we just need to figure out how much this will cost. Since he charges $5.00 per half hour, we need to get 40 minutes in terms of half hours:


Last, we just multiply his half-hour rate by the amount of half hours he is shoveling for:


I'll let you simplify the fraction.