What percent of numbers from 1 to 30 have squares that end in the digit 4?

30%

20%

35%

40%

Solution: Clearly, the numbers which have 2 or 8 in the unit's digit, have squares that end in the digit 4. such numbers from 1 to 30 are 2, 8, 12, 18, 22, 28. Number of such numbers = 6. .'. Required percentage = 6/30 * 100 = 20%.

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