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42/100
It is a prime number. It is one less than a dozen. In hexadecimal notation it is B. Are you having fun yet?
28/42
The easiest way to find a percent is to turn the percentage into a decimal. You do this by placing the percentage over 100. 42% is the same as 42/100, which equals .42 in decimal notation. Now, take the decimal notation and multiply it by your number, in this case 125. .42 * 125 = 52.5
Hexadecimal uses the digits 0-9 and the letters a-f (in either upper case A-F, or lower case a-f). You appear to have used a letter O in upper case and lower case (o). Neither is a valid [standard] hexadecimal digit; so 3EO and 3Eo both mean the same in hexadecimal: a non-valid number. 3E0 and 3e0 are both valid hexadecimal numbers that mean the same (as the decimal number 992). In C, to signify a hexadecimal number it is preceded by 0X or 0x (that is zero-letter X), as in 0x3E0, etc.