exam Maths Puzzle Numerical Ability

I need help with linear model

the cost of producing 4 units is 204.80 the cost of producing 8 units is 209.60 how much does it cost to produce 12 units

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exam Other Question

the elevator in the washington monument takes 75 seconds to travel 500 feet to the top of the floor. what is the speed of the elevator in miles per hour? 2(-5)-3(-4)
I tied doing this one in a line, but I came up with 28, which is not one of the options for the answer.