Jeff Tan's answer to Oscar's Secondary 3 E Maths question.
Thanks for putting a little knowledge in my brain :) but I am stuck with the second question. I tried B=1000 x 5^-2 and I get 10, the 990/1000 x 100% get me 99%. The correct answer should be 96%. How to get that? Pls enlighten with brief explanation if you can help. Thank you :)