The business earned CZK 98,400 in the shop in three weeks. In the second week, sales were 20% higher than the first week. The third week was 10% lower than the second week. How much did business earn in each week?

a =  30000
b =  36000
c =  32400

### Step-by-step explanation:

a+b+c=98400
b = a + 20/100 a
c = b - 10/100 b

a+b+c=98400
b = a + 20/100•a
c = b - 10/100•b

a+b+c = 98400
120a-100b = 0
90b-100c = 0

a = 30000
b = 36000
c = 32400

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