Question 1156456
Let {{{ C }}} = the cost of B minus the cost of A
For any given number of days, B will cost $20
more than A.
Let {{{ n }}} = number of miles driven
{{{ C = 20 - ( 20/100 )*n }}}
I want the range of {{{ n }}} for which {{{ C }}}
is negative
{{{ 20 - ( 20/100 )*n < 0 }}}
{{{ .2n > 20 }}}
{{{ n > 100 }}}
You save money for any miles greater than 100 miles
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Check:
I'll choose {{{ n = 101 }}} mi
Plan A:
{{{ C = 30 + .2*101 }}}
{{{ C = 30 + 20.2 }}}
{{{ C = 50.2 }}}
Plan B:
{{{ C = 50  }}}
Plan B saves money
OK