the students in Naomi's class earned 20% of the money received from selling these calendars. they sold 650 calendars last year. they sold 600 calendars this year. based on the information, how much money did they make each year.

Selling price of each calender this year = $13.25

Selling price of each calender last year = $13.25/106 * 100

= $12.50

Earning percentage per calender = 20%

Earning per calender this year = $13.25 * 20%

= $2.65

Earning per calender last year = $12.50 * 20%

= $2.50

Total earning this year = 600 * $2.65

= $1,590

Total earning last year = 650 * $2.50

= $1,625

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