Calculate Field Using Different Field From Different Table?

i have got this table

Table 1:-- List of available classes

Design view

Class -- Primary key ---text

Subject ----text

Num. Lessons---- Number

Enrolments ---- Number

Max Class Size--- Number

Action -- Calculated because if enrollment is higher then max. class size then its says full otherwise it will tell enrol

Table 2:-- Teacher And Class Income

Class --- text

enrolment --- number

max class size ---- number

income per enrolment ----- currency

incomer per class ----- currency ?

1) but what i wanna do is if i change enrollment and max class size VALUE IN TABLE 1 ... i want that change in table 2 enrollment and max. class size FIELD AS WELL For e.g. if i change enrollment =25 and max class size = 30 ,,, i want that change in table 2 .......so i want that table 2 should display Enrollment = 25, max class size = 30 ,I want this things in TABLES not queries , what should i do... and i compulsory have to use access... NOT EXCEL.

2) then i want that Total Incomer per class (In Table 2) = Enrollment * Income per enrollment so that value should be display on total incomer per class ....So if i change enrollment value ... then the total income per class value has to change ....

3) i want in table that my total income in all class should display in same table ( Table 2)