130% of 78 as a fraction is 507/5 or 1012/5
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"Percent" means "out of" or "over" 100, so put it over "100" and simplify: 78% = 78/100 = 39/50
78 = 60% 78/6 = 10% 780/6 = 100% = 130 Check: 130 x 0.6 = 78
130% of 60 = 130% * 60 = 1.3 * 60 = 78
78
10% of 130 is 13. 13 x 4 = 52. 130 - 52 = 78. So 40% off 130 is 78.