Question 885400
Let {{{ p }}} = the original price / can
{{{ p + .2p }}} = the increased price / can
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{{{ 300p }}} used to buy {{{ 300 }}} cans
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Let {{{ c }}} = number of cans that 
that could be bought for {{{ 300p }}}
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( number of cans bought ) = ( old price for 300 cans ) / ( new price / can )
{{{ c = 300p / ( p + .2p ) }}}
{{{ c = 300 / ( 1 + .2 ) }}}
{{{ c = 300 / 1.2 }}}
{{{ c = 250 }}}
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250 cans can be purchased