a) Multiply 10 by each of the numbers: 200, 40, 80. Then divide each by 100: 2, 0.4, 0.8 kg.
b) 525, 175, 175; divide by 100: 5.25, 1.75, 1.75 kg.
c) 750, 250, 150; 7.5, 2.5, 1.5 kg.
d) 200, 120, 80; 2, 1.2, 0.8 kg.
Note that, because the percentages don’t add up to 100% there are other ingredients that make up the rest of the fertiliser.