// if( ( (b*1.25) is greater than d ) and ( d is greater than 1.05 ) )
if (b*1.25>=d && d>1.05)
{
// do stuff
}
// if( false ) // (b*125 >= d ) is either true (1) or false (0)
if (b*1.25>=d>1.05) // neither 1 nor 0 is greater than 1.05
{
// do stuff
}