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 grey and purple pens sold?
- Each black pen cost $0.80 more than each pink pen. The bookshop collected $78 from selling the pink pens. What was the price of 1 black pen?
(a)
Difference between number of grey and purple pens sold
= 37 - 23
= 14
(b)
Number of pink pens sold = 10
Price of 1 pink pen
= 78 ÷ 10
= $7.80
Price of 1 black pen
= 7.80 + 0.80
= $8.60
Answer(s): (a) 14; (b) $8.60