exam Maths Puzzle Numerical Ability

Please answer and explain,

The fixed cost for a widget is $43, with a variable cost of $81. How much would it cost to produce 200 widgets?

Thank you for providing the cost.

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exam Other Question

Another problem I'm having troubles with is:
perform the indicated operation and simplify:

1- 2x-1 over x^2-4 over or divided by 1+ 1/x-2

Translation:
1- 2x-1 divided by x Explain the similarities between radicals and rational exponent notation.

For a process other than representing root operations with radicals or rational exponents, provide at