Question 490139
Let {{{x}}} = number of times in a month bus is used
{{{ 1.25x = 15 + .75x }}}
{{{ 1.25x - .75x = 15 }}}
{{{ .5x = 15 }}}
{{{ x = 30 }}}
If the bus us used 30 times in a month,
{{{ 1.25*30 }}} = $37.50
and
{{{ 15 + .75*30 - 15 + 22.5 }}}
{{{ 15 + 22.5 }}} = $37.50
OK