The bookshop sells 4 different coloured pens. The line graph shows the number of pens sold for each colour in a week.
- What was the difference between the number of white and green pens sold?
- Each yellow pen cost $0.60 more than each black pen. The bookshop collected $71 from selling the black pens. What was the price of 1 yellow pen?
(a)
Difference between number of white and green pens sold
= 49 - 14
= 35
(b)
Number of black pens sold = 10
Price of 1 black pen
= 71 ÷ 10
= $7.10
Price of 1 yellow pen
= 7.10 + 0.60
= $7.70
Answer(s): (a) 35; (b) $7.70