The line graph shows the amount of money Mark spent from July to December.

1. Of the amount Mark spent in October, $145 was spent on food and the remaining amount was spent on transport. How much did he spend on transport in October?
2. In which month did Mark spend $240 less than the previous month? Give your answer in this format. (Eg Jan)

(a)
Amount that Mark spent in October = $520

Amount that Mark spent on transport
= 520 - 145
= $375

(b)
To find a decrease in a line graph, look for a decreasing slope. 

The 2 decreasing slopes are from July to August and October to November. Now, find the month when Mark spent $240 less than the previous month.

Amount that Mark spent in July = $340
Amount that Mark spent in August = $100

Amount that Mark spent in August less than July
= 340 - 100
= $240 (✓)

Amount that Mark spent in October = $520
Amount that Mark spent in November = $280

Amount that Mark spent in November less than October
= 520 - 280
= $240 (x)

The month that Mark spent $240 more than the previous month = Aug

Answer(s): (a) $375; (b) Aug