a car park charges 20 p for the first hour 10 p for the next hour and 5 p for each additional hour how much does the car charges for 8 hours
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parking charges for 1st 10hrs = ₹20parking charges for subsequent hrs=₹5total park time = xy=(20+5) x-2y=20+5x-10y=20-10+5xy=10+5x5x-y=-10
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