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according to the question, we must setup a proportion like this :
\(\frac{a}{b} = \frac{c}{d}\)

call : x, the amount he will have to spend

to save 30 dollars, the proportion becomes :
\(\frac{6}{100} = \frac{30}{x}\)

solving gives, x = 500, and it is in the numerator.....

and i see theres a mistake in the question : its not 30%, it should be 30 $.

Thank u so much @ganeshie8 !!!!!!!!!!!!!!!!!!!!!!!!!!! :)

yw... :))

Yeah, sorry it ws my mistake :)

i m sorry about that

lol okay... its easy to make out so no probs... :D

your awesome @ganeshie8 !!!!!!!!!! :)

minor correction @ganeshie8 . x is 500 and it was in the denominator

oops! you're right.... good catch @rsadhvika thank you :)