maculay's duration

sir in macaulay's duration is we have been told that interest rates fall by 0.5% from 9.5%, say. and modified duration has been calculated 3.754. bond price before fall was 1200USD and face value is 1000USD. then, the change in bond price will be calculated as follows? 1200x3.754x0.5%/1.09=20.66USD, giving us bond price of 1220.66USD right?