PSLE The bar graph shows the number of correction tapes sold from Jul to Sep. The number of correction tapes sold is not shown on the scale.
- What was the percentage increase in the number of correction tapes sold from Jul to Aug?
- There were 120 less correction tapes sold in Jul than in Sep. How many correction tapes were sold in Jul?
- The average number of correction tapes sold from Jul to Nov was 191. What was the average number of correction tapes sold in Oct and Nov?
(a)
Percentage increase in the number of correction tapes 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 → 120
1 interval → 120 ÷ 8 = 15
Number of correction tapes sold in Jul
= 2 intervals
= 2 x 15
= 30
(c)
Total intervals from Jul to Sep
= 2 + 5 + 10
= 17
Total number of correction tapes sold from Jul to Sep
= 17 intervals
= 17 x 15
= 255
Total number of correction tapes sold from Jul to Nov
= 5 x 191
= 955
Number of correction tapes sold from Oct to Nov
= 955 - 255
= 700
Average number of correction tapes sold in Oct and Nov
= 700 ÷ 2
= 350
Answer(s): (a) 150%; (b) 30; (c) 350