function CalculateSum(Atext, Btext, Ctext, form)
{
var A = parseFloat(Atext);
var B = parseFloat(Btext);
var C = parseFloat(Ctext);

form.mpg.value  =  (C / B) * 4.54609;
form.mpl.value  =  (C / B);
form.cost.value =  (A * B) /100;
}

function addup(Dtext, Etext, Ftext, form)
{
var D = parseFloat(Dtext);
var E = parseFloat(Etext);
var F = parseFloat(Ftext);

form.capacity.value  =  (E / D) * 100;
form.how_much.value  =  (F /(E / D * 100))* 4.54609;
form.distance.value =  (F /(E / D * 100));
}

function ClearForm(form)
{
form.input_A.value = "";
form.input_B.value = "";
form.input_C.value = "";
form.mpg.value  = ""; 
form.mpl.value  = ""; 
form.cost.value  = ""; 
}

function clear_entries(form)
{
form.input_D.value = "";
form.input_E.value = "";
form.input_F.value = "";
form.capacity.value  = ""; 
form.how_much.value  = ""; 
form.distance.value  = ""; 
}