Saly saves 1/2 * $6/day = $<<1/2*6=3>>3/day.
Since each year have 365 days, the total amount of money Sally will save in a year is $3/day * 365 days/year = $<<3*365=1095>>1095/year
Bob saves 1/2 * $4/day = $<<1/2*4=2>>2/day.
The total amount of money Bob will have saved in a year is $2/day * 365 days/year = $<<2*365=730>>730/year
In total, Sally and Bob would have saved $730 + $1095 = $<<730+1095=1825>>1825
#### 1825