oblicz a) 12% liczby 600 b)5% liczby 1000 c) 65%liczby 20 . prosze szypko

a) 12% liczby 600 1% → 6 2% → 12 10% → 60 12% → 72 b) 5% liczby 1000 1% → 10 5% → 50 c) 65% liczby 20 1% → 0,2 5% → 1 20% → 4 60% → 12 65% → 13

a. 10% z 600 = 60 1% z 600 = 6, więc 2% = 2*6 = 12 12% z 600= 60+12=72 b. 10% z 1000 = 100 5% = 1/2*100 = 50 c. 50% z 20 = 10 10% z 20 = 2 5% z 20 = 1 65% z 20 = 10+2+1=13