Used instead of the key, interprets the final operation carried out in the current calculation as follows:
If the final operator is + or - the second argument is interpreted as percentage of the first operand.
If the final operator is * divide the result of the multiplication by 100.
If the final operator is / give the left operand as a percentage of the right operand.
In all other cases the % key gives identical results to the = key.
150 + 50 %gives 225 (150 plus 50 percent of this amount)
42 * 3 %gives 1.26 (42 * 3 / 100)
45 / 55 %gives 81.81... (45 is 81.81.. percent of 55)