In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Let me give you an example: Problem: what is difference between biggest and smallest fraction among 2 / 3 , 3 / 4 , 4 / 5 and 5 / 3
Options: a ) 2 / 5 , b ) 3 / 5 , c ) 1 / 6 , d ) 1 , e ) none of these
The answer to this example can be: d
Here is why: "explanation : 2 / 3 = . 66 , 3 / 4 = . 75 , 4 / 5 = . 8 and 5 / 3 = 1.66 so the biggest is 5 / 3 and the smallest is 2 / 3 their difference is 5 / 3 - 2 / 3 = 3 / 3 = 1 option d"

OK. solve this:
Problem: mona and donald fly to rome for the weekend . they take cash only in notes of $ 10 and notes of 10 . mona carries 3 times the amount of euros donald carries . she also carries as many dollars as donald carries . the number of 10 notes they take is double the number of $ 10 notes they take . if donald carries a total of 39 notes ( of either $ 10 or 10 , ) then what is the total number of notes ( of either $ 10 or 10 , ) they take ?
Options: a ) 130 , b ) 80 , c ) 100 , d ) 120 , e ) 150
Answer:
a