Question 1138229
.


            It is simple entertainment problem, designed and intended to be solved MENTALLY, without using equations.



<pre>
1) compare Monday and Wednesday:


   Monday    :   2 coffee and 1 doughnut  PLUS tip    $1.70

   Wednesday :   1 coffee and 1 doughnut  PLUS tip    $1.30

  -----------------------------------------------------------  The difference is

                 1 coffee                              $0.40    <U>ANSWER</U>



2)  compare Tuesday and Wednesday:


    Tuesday   :   1 coffee and 2 doughnut  PLUS tip    $1.65

    Wednesday :   1 coffee and 1 doughnut  PLUS tip    $1.30

  -----------------------------------------------------------  The difference is

                               1 doughnut              $0.35    <U>ANSWER</U>
</pre>

SOLVED.