50 becuase you use the rounding rules. If the second number is 5 or higher then you round up if it is 4 or lower than it rounds down.
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52 rounded to the nearest tens place is 50
51.54 is 52 when rounded to the nearest whole number.
50
12 percent of 52 = 6.24 Rounded to the nearest tenth = 6.2
4.5