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cara 1, jadikan pecahan biasa:
45/10 x 40/100 x 4/1 = 72/10 = 7 2/10 = 7 1/5
cara 2, jadikan desimal
4,5 x 0,4 : 0,25 = 7,2
cara 3, jadikan persen:
450% x 40% : 25% =720%