A sports shop had 450 ping pong balls for sale. Each ping pong ball is sold at $3. 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 $11 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
= 450 - 80 - 60 - 70
= 240
Fraction of ping pong balls left at the end of Day 3
=
240450=
815 (b)
Number of ping pong balls sold from Day 4 to Day 6
= 60 + 60 + 50
= 170
Amount that it would collect if it sold the 170 ping pong balls at the original price
= 170 x 3
= $510
Number of sets of 5 ping pong balls
= 170 ÷ 5
= 34
Amount that it would collect if it sold the 170 ping pong balls at every 5 ping pong balls at $11
= 34 x 11
= $374
Amount that it would collect less from the sale of the ping pong balls
= 510 - 374
= $136
Answer(s): (a)
815; (b) $136