the true discount on a bill of rs . 540 is rs . 90 . the banker ' s discount is :
"p . w . = rs . ( 540 - 90 ) = rs . 450 . s . i . on rs . 450 = rs . 90 . s . i . on rs . 540 = rs . ( 90 / 450 ) x 540 = rs . 108 . b . d . = rs . 108 . answer : b"
multiply(divide(90, subtract(540, 90)), 540)