Question 951975
Your only choice is do everything in variables, except for the "10%" part, and then compare.


10% increase means size change by factor of 1.10.


Large Can: {{{ h*pi*((1.1)d/2)^2}}}


Smaller or original Can:  {{{h*pi*(d/2)^2}}}


Process the large can volume expression into a volume formula and a factor.  What percent  increase is that?


What about h and d?
THEY ARE VARIABLES AND ARE UNDERSTOOD THROUGH CONTEXT.  THEIR VALUES ARE IRRELEVANT.  YOU DO NOT GIVE THEM ANY SPECIFIC VALUE ASSIGNMENT UNLESS YOU WANT TO.
NOTE:  d AND h CAN BE ANY POSITIVE REAL NUMBERS.