A sports shop had 400 ping pong balls for sale. Each ping pong ball is sold at $5. At the end of each day, the number of ping pong balls sold was recorded in the bar graph shown.
- What fraction of the total number of ping pong balls was left at the end of Day 3? Express your answer in its simplest form.
- If the shop decided to sell every 5 ping pong balls at $22 from Day 4 onwards, how much less would it collect from the sale of the ping pong balls?
(a)
Number of ping pong balls left at the end of Day 3
= 400 - 95 - 95 - 70
= 140
Fraction of ping pong balls left at the end of Day 3
=
140400=
720 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 80 + 80 + 75
= 235
Amount that it would collect if it sold the 235 ping pong balls at the original price
= 235 x 5
= $1175
Number of sets of 5 ping pong balls
= 235 ÷ 5
= 47
Amount that it would collect if it sold the 235 ping pong balls at every 5 ping pong balls at $22
= 47 x 22
= $1034
Amount that it would collect less from the sale of the ping pong balls
= 1175 - 1034
= $141
Answer(s): (a)
720; (b) $141