Trinh has a part-time job at the local service station, where he is entitled to a staff discount of 10% on petrol and 15% on food and drink. On a particular day she buys 20L of petrol, which sells for 153.4 cents per liter, and a can of coke and a packet of chips, which cost him $2.50 cents and $3.05 respectively. How much was her bill, after discount, for that day?

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I keep getting $32.33 as the answer

But the solutions say the answer is $21.64

Weird. I got the same answer too.

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