It is 520
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515 to the nearest ten is 520. When rounding a number to the nearest ten, you look at the digit in the tens place. If the digit to the right of it is 5 or greater, you round up. In this case, the digit in the tens place is 1, and the digit to the right of it is 5, so you round up to 520.
Well, honey, 515 rounded to the nearest ten is 520. It's not rocket science, just basic math. So, there you have it, no need to overcomplicate things.