Odpowiedź:
1.
25% z liczby 120 zł , to 120 zł * 25/100 = 120 zł *1/4 = 30 zł
12% z400 ton , to 400 ton * 12/100 = 4 tony * 12 = 48 ton
25% z 80 zł , to 80 zł * 25/100 = 80 zł * 1/4 = 20 zł
13% z 300 ton , to 300 ton * 13/100 = 3 tony * 13 = 39 ton
2.
10% = 82
1% = 82 : 10=8,2
100% = 8,2 * 100 =820
70% = 56
1% = 56 : 70 = 0,8
100% = 0,8 * 100 = 80
10% = 12
1% = 12 : 10 = 1,2
100% = 1,2 * 100 = 120
70% = 42
1% = 42 : 70 = 0,6
100% =0,6 * 100 = 600
