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About 68.42%
% of students who passed = 13/19 * 100% = 68.42%
Because 10*13 = 130 and 130*2 =260, it follows that 260 is twenty times the size of 13. Hence, going from 13 to 260 produces an increase of 19 times the quantity of comparison (the value we deem as 100%) so the percent increase will be the product of 100 and 19 as percent. the percentage increase is 1,900%.
Expressed as a percentage, 19/100 is equal to 19 percent.
13 out of 19 in decimal = 0.684213/19:= 13 ÷ 19= 0.6842 in decimal