PSLE The bar graph shows the number of correction tapes sold from Jan to Mar. 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 Jan to Feb?
- There were 80 less correction tapes sold in Jan than in Mar. How many correction tapes were sold in Jan?
- The average number of correction tapes sold from Jan to May was 144. What was the average number of correction tapes sold in Apr and May?
(a)
Percentage increase in the number of correction tapes from Jan to Feb
=
5 - 22 x 100%
=
32 x 100%
= 150%
(b)
Difference in intervals between Mar and Jan
= 10 - 2
= 8
8 intervals → 80
1 interval → 80 ÷ 8 = 10
Number of correction tapes sold in Jan
= 2 intervals
= 2 x 10
= 20
(c)
Total intervals from Jan to Mar
= 2 + 5 + 10
= 17
Total number of correction tapes sold from Jan to Mar
= 17 intervals
= 17 x 10
= 170
Total number of correction tapes sold from Jan to May
= 5 x 144
= 720
Number of correction tapes sold from Apr to May
= 720 - 170
= 550
Average number of correction tapes sold in Apr and May
= 550 ÷ 2
= 275
Answer(s): (a) 150%; (b) 20; (c) 275