Your company spends 15% of their budget on rent each year. their operating budget was $45,000.

If you would like to know the amount they spend on rent each year you would take 15% of $45,000    or .15 x 45,000  = $6,750

You could also do it mentally  10% of 45,000 is 4500  plus
                                              5% of 45,000 is 2250 (1/2 of 10% or 1/2 of 4500)
Together they add up to $6750