>>>What do you want for the case when Perc > 100 ?
>>
>>
>>
>>:-)))))))))))
>>You already have it. It is "A" :-))))
>>Just because 100.01 is bigger than 70 :-)
>what is your mean Boris:please explain me more.

Boris meant that if Perc> 100, the second case will evaluate to true and therefore the grade will be A.

If you write the first condition as Perc >= 80, 'A+' instead of between, then you will get A+ for everything greater than 80 even for imaginary cases of 110%