The amount of money he need to save is $1570.
Given data
In January, he saved $100
In February, he saved $80
In March, he saved $50
Target saving = $1,800
The amount need to save = $1,800 - ($100 + $80 + $50)
The amount need to save = $1,800 - $230
The amount need to save = $1570
In conclusion, the amount of money he need to save is $1570.
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