Index of same items in a list

[Itjustmifdhal]

I already try it.However, somehow the result is different.Just like this:

Sorting numbers and multiply each numbers

Hello, I'm very new in MIT apps inventor.I still don't understands few blocks and how to use them.So,I have a question.Can anyone tell me how to make an instruction on how to calculate each digit of a number and can you show me have to do it .I want to make the apps to multiply each digits by a number wanted by the users and sum all of it.For example, if the user enters "2351" and multiply by "2" it will be "2×2+3×2+5×2+1×2=(4)+(6)+(10)+(2)=22".Thank you for reading this:)

I do get "72" when entered "2351" but when I entered "1011" the answer was wrong.I supposed to get "26",but instead i get "6".I've check why it happened.This is because the 2nd and the 3rd "1" index followed the 1st "1". (1×2^1)+(0×2^2)+(1×2^1)+(1×2^1)=6.I hope you can help me.TQ