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 red and silver pens sold?
- Each blue pen cost $0.30 more than each black pen. The bookshop collected $78 from selling the black pens. What was the price of 1 blue pen?
(a)
Difference between number of red and silver pens sold
= 68 - 39
= 29
(b)
Number of black pens sold = 12
Price of 1 black pen
= 78 ÷ 12
= $6.50
Price of 1 blue pen
= 6.50 + 0.30
= $6.80
Answer(s): (a) 29; (b) $6.80