Answer:
Family A=32.000 and Family B=6.000
Step-by-step explanation:
there are the calculations
![Family A=10.000*0\%+20.000*10\%+20.000*20\%+20.000*30\%+50.000*40\%](https://img.qammunity.org/2020/formulas/business/college/ilz3d2h6qwdwmsp2dn3xyqkkhet8arq21v.png)
![Family A=32.000](https://img.qammunity.org/2020/formulas/business/college/o7qwokvcwx0l5uvde6e7vujtks4xd3ezxn.png)
the key here to apply the formula is to go adding the value so the first 10.000 multiplied by 0, the 20.000 multiplied by 10%..., but here we have 30.000 of the total 120.000
![Family B=10.000*0\%+20.000*10\%++20.000*20\%](https://img.qammunity.org/2020/formulas/business/college/g4qwxg3vpm0lvtfy6ss7c2dx6i0zcy12co.png)
![Family B=6.000](https://img.qammunity.org/2020/formulas/business/college/3av6ljn1zgm60wj5g70wkaevn88kgjr73b.png)