kermit has been studying a maths unit the semester and is about to sit the final exam. in the exam marks are awarded as interges only. there are three assessment tasks for the unit each with its own weighting as shown in the table below:

assessment task

written assignment ------- weighted 30% ------ mark 40/50

participation ------- weighted 30% -------- mark 12/20

exam --------- weighted 40% ------- mark ?/100

the combines assessment mark gives an overall grade to the unit based on the following:

49% or less = fail

50%-59% = pass

60%-69% = credit

70%-79% = Distinction

80% or more = distinction

how many marks does kermit need in the exam to get a credit in the unit.

how did you determine the answer (using mathametics