a)=58 * 20 / 100 = 11,6
или
58 * 0,2 = 11,6
b)= 40=100% 50=100/2 =40/2=20
20+40 = 60
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a)=58 * 20 / 100 = 11,6
или
58 * 0,2 = 11,6
b)= 40=100% 50=100/2 =40/2=20
20+40 = 60