to solve this problem you can do a proportion
[tex] \frac{x}{215} = \frac{35\%}{100\%} [/tex]
to find 'x', we have to cross multiply the numbers.
[tex]215 \times 35[/tex]
and
[tex]100 \times x[/tex]
this will get you
[tex]7525 = 100x[/tex]
to get 'x', we have to divide by 100 on each side
[tex] \frac{7525}{100} = \frac{100x}{100} [/tex]
your answer will be
[tex]75.25 = x[/tex]
so, Chris must raise 75.25 dollars by himself
