If the price of a commodity is increased by 20% according to the cost price, if the commodity is sold at 10% discount and the selling price is 270 yuan, how much is the cost of this commodity? (calculated by equation) How many hectares is a rectangular field 280m long and 250m wide? If 960kg cotton is produced per hectare, how many kg cotton can be produced? (calculated by equation)

1、 Set the cost price as X
X*(1+20%)*90%=270
1.08X=270
X=250
2、 Let the yield be x and the area be y
Y = L * w = 280 * 250 = 70000 (M2) = 7 ha
X = unit output * y = 960 * 7 = 6720 kg

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