The first value drop of the lawnmower was 25/100 * 100 = $<<25/100*100=25>>25.
So the lawnmower was worth 100 - 25 = $<<100-25=75>>75.
Over the next year, the value dropped another 20%, which is 20/100 * 75 = $<<20/100*75=15>>15.
So after all this time, Ben's lawnmower is worth 75 - 15 = $<<75-15=60>>60.
#### 60