the unit digit in the product ( 115 * 297 * 196 * 108 ) is :
"explanation : unit digit in the given product = unit digit in ( 5 * 7 * 6 * 8 ) = 0 answer : d"
subtract(multiply(multiply(multiply(115, 297), 196), 108), subtract(multiply(multiply(multiply(115, 297), 196), 108), add(const_4, const_4)))