A sports shop had 500 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 $17 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
= 500 - 65 - 75 - 60 - 95
= 205
Fraction of ping pong balls left at the end of Day 4
=
205500=
41100 (b)
Number of ping pong balls sold from Day 5 to Day 6
= 60 + 85
= 145
Amount that it would collect if it sold the 145 ping pong balls at the original price
= 145 x 4
= $580
Number of sets of 5 ping pong balls
= 145 ÷ 5
= 29
Amount that it would collect if it sold the 145 ping pong balls at every 5 ping pong balls at $17
= 29 x 17
= $493
Amount that it would collect less from the sale of the ping pong balls
= 580 - 493
= $87
Answer(s): (a)
41100; (b) $87