A sports shop had 450 ping pong balls for sale. Each ping pong ball is sold at $4. 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 5 ping pong balls at $16 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 - 50 - 65 - 95 - 70
= 170
Fraction of ping pong balls left at the end of Day 4
=
170450=
1745 (b)
Number of ping pong balls sold from Day 5 to Day 6
= 70 + 50
= 120
Amount that it would collect if it sold the 120 ping pong balls at the original price
= 120 x 4
= $480
Number of sets of 5 ping pong balls
= 120 ÷ 5
= 24
Amount that it would collect if it sold the 120 ping pong balls at every 5 ping pong balls at $16
= 24 x 16
= $384
Amount that it would collect less from the sale of the ping pong balls
= 480 - 384
= $96
Answer(s): (a)
1745; (b) $96