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Mary was fifteen and her cousin was twelve, so there was a three year disparity in their ages.
% rate = 1%note: $1 = 100 pennies= 1/$1 * 100%= 1/100 * 100%= 1 * 1%= 1%
1 to 1, 1:1, 1/1 100% Out Of 100% = 1
one hundred 1/100 x 100 = 100/100 = 1/1 = 1