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 4? Express your answer in its simplest form.
- If the shop decided to sell every 6 ping pong balls at $15 from Day 5 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 4
= 450 - 78 - 78 - 120 - 84
= 90
Fraction of ping pong balls left at the end of Day 4
=
90450=
15 (b)
Number of ping pong balls sold from Day 5 to Day 6
= 66 + 120
= 186
Amount that it would collect if it sold the 186 ping pong balls at the original price
= 186 x 3
= $558
Number of sets of 6 ping pong balls
= 186 ÷ 6
= 31
Amount that it would collect if it sold the 186 ping pong balls at every 6 ping pong balls at $15
= 31 x 15
= $465
Amount that it would collect less from the sale of the ping pong balls
= 558 - 465
= $93
Answer(s): (a)
15; (b) $93