Answer:
The seventh-grade class earned more money in September by $36
Step-by-step explanation:
a)
The price of flowers in September was $1.50. In October, the price went up 20%
The increase in the price was 20*1.50/100=$0.30. So the new price is $1.80
$1.80
b) In September, the seventh-grade class sold 900 flowers for
900*1.50 = $1,350. They earned 40% of it, that is
40*1,350/100 = $540
In October they sold 700 flowers for
700*1.80 = $1260. They earned 40% of it
40*1260/100 = $504
The difference was $540-$504=$36
The seventh-grade class earned more money in September by $36
