Mathematical problems. Please do me a favor. - Training Enrollment Network

Mathematical problems. Please do me a favor.

9000×( 1-94%)= 540 yuan ... makes less money.

"1" based on the original price of 20 units.

540( 1-85%)= 3600 yuan ... The unit "1" is the original price of 20 units.

3600÷20 = 180 yuan ... the original price of each set.

180 ÷ (1+20%) =150 yuan ... the original purchase price of each set.

9000÷ (180-150) = 300 ... the number of these fans.

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