Question 763414
The store's "rate" of sales increase is
{{{ 50000 / 1500 }}} ( sales increase ) / ( advertising spent )
Let {{{ s }}} = sales increase if the store spends $4500 on advertising
-------------
You can set up a ratio:
{{{ 50000 / 1500 = s / 4500 }}}
{{{ 500 / 15 = s / 4500 }}}
{{{ 100 / 3 = s / 4500 }}}
{{{ 100*4500 = 3s }}}
{{{ s = 150000 }}}
sales will increase $150,000 if $4,500 is spent on advertising