PSLE The bar graph shows the number of staplers sold from Jul to Sep. The number of staplers sold is not shown on the scale.
- What was the percentage increase in the number of staplers sold from Jul to Aug?
- There were 128 less staplers sold in Jul than in Sep. How many staplers were sold in Jul?
- The average number of staplers sold from Jul to Nov was 140. What was the average number of staplers sold in Oct and Nov?
(a)
Percentage increase in the number of staplers from Jul to Aug
=
5 - 22 x 100%
=
32 x 100%
= 150%
(b)
Difference in intervals between Sep and Jul
= 10 - 2
= 8
8 intervals → 128
1 interval → 128 ÷ 8 = 16
Number of staplers sold in Jul
= 2 intervals
= 2 x 16
= 32
(c)
Total intervals from Jul to Sep
= 2 + 5 + 10
= 17
Total number of staplers sold from Jul to Sep
= 17 intervals
= 17 x 16
= 272
Total number of staplers sold from Jul to Nov
= 5 x 140
= 700
Number of staplers sold from Oct to Nov
= 700 - 272
= 428
Average number of staplers sold in Oct and Nov
= 428 ÷ 2
= 214
Answer(s): (a) 150%; (b) 32; (c) 214