His utilities cost 1/2 the amount of his $250.00 car payment so his utilities cost 250/2 = $<<250/2=125.00>>125.00
All total, his bills cost him 775+250+125+50 = $<<775+250+125+50=1200>>1,200
He makes $2500 a month and his bills cost $1200 a month so that leaves him with 2500-1200 = $<<2500-1200=1300.00>>1300.00
He wants to put half of $1300 into a retirement account so he will invest 1300/2= $<<1300/2=650>>650 into his retirement account
He had 1300 and puts $650 into his retirement account so that leaves him with 1300-650 = $<<1300-650=650>>650 remaining
#### 650