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Food charge = y
number of days = x

charge for first day =rs. 100
for subsequent days, charge = rs. 50 per day
charge for (x-1) days = 50×(x-1) = 50(x-1) = 50x-50

total charge, y = 100 + 50x - 50
⇒ y = 50x+50
y = 50(x+1)
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