<human>:  A year ago, the total cost of buying a lawnmower was 2/5 times less than the cost it goes for now. If the cost was $1800 a year ago, calculate how much it would cost Mr. Lucian to buy 4 such lawnmowers.
<bot>: How much more does it cost to buy a lawnmower now than it did a year ago? ** If the price of a lawnmower was $1800 a year ago, 2/5 less than the cost right now, then it now costs 2/5*1800 = $720 more to buy one lawnmower.
How much does it cost to buy a lawnmockr right now? ** The total cost of buying one lawnmower right now is $1800+$720 = $<<1800+720=2520>>2520
How much will it cost Mr. Lucian to buy 4 such lawnmowers? ** To purchase 4 such lawnmowers, Mr. Lucian will have to pay $2520*4 = $<<2520*4=10080>>10080
#### 10080