exam Maths Puzzle Numerical Ability

How do i find the original price after sale tax has been added, such as:

The cost of the camera with sales tax included was $50(sales tax was 5%), what was the original cost of the camera?

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exam Other Question
The budget deficit for Central City can be modeled by the equation
D = 0.5n + 6.5
where n is the number of years since 1990 and D is the deficit in millions of dollars.
Gra How do you simplify the following fraction?

a^2 - 2ab + b^2
________________
a - b