Josiah saves 0.25 x 24= $<<0.25*24=6>>6.
Leah saves 0.50 x 20 = $<<0.50*20=10>>10.
Megan saves $1 x 12 = $<<1*12=12>>12.
Together, the children save $6 + $10 + $12 = $<<6+10+12=28>>28.
#### 28