The bookshop sells 4 different coloured envelopes. The line graph shows the number of envelopes sold for each colour in a week.
- What was the difference between the number of black and grey envelopes sold?
- Each blue envelope cost $0.10 more than each red envelope. The bookshop collected $60 from selling the red envelopes. What was the price of 1 blue envelope?
(a)
Difference between number of black and grey envelopes sold
= 43 - 31
= 12
(b)
Number of red envelopes sold = 40
Price of 1 red envelope
= 60 ÷ 40
= $1.50
Price of 1 blue envelope
= 1.50 + 0.10
= $1.60
Answer(s): (a) 12; (b) $1.60