Give the step-by-step reasoning process and then the final answer. A dime has the same value as 10 pennies and a nickel has the same value as 5 pennies. How many pennies will Grace have by exchanging her 10 dimes and 10 nickels?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Grace will have 10 x 10 = 100 pennies from her dimes. She will have 10 x 5 = 50 pennies from her nickels. Therefore, she will have a total of 100 + 50 = 150 pennies.
The final answer: 150.