[tex] \frac{8}{20} [/tex] is how many [tex] \frac{1}{100} th's [/tex] of a ton?
You need to convert the fraction [tex] \frac{8}{20} [/tex] into hundredths by multiplying the top and bottom by 5. Because you are multiplying by [tex] \frac{5}{5} [/tex], or essentially by 1, this is allowable. You now have the fraction [tex] \frac{40}{100} [/tex], since 5 times 8 is 40, and 5 times 20 is 100.
Therefore the solution is [tex] \frac{40}{100} [/tex]