exam Maths Puzzle Numerical Ability

what is the formula to add 35% to a dollar amout Sample (if i have a picture that is selling for $50.00 dollars and i need to add 35% what would the number be). also what is the formula.

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exam Other Question

You need to purchase a textbook for nursing school. The book cost $80.00, and the sales tax where you are purchasing the book is 8.25%. You have $100. How much change will you receive back? Solve:

Jim drove 196 miles in 4 hours. If he can keep the same pace, how long will it take him to drive 1078 miles?

I think you use the formula D=R/T where D=196 miles, R=4 hours and we need to solve for T? but I am not sure. Please help!