My brain the cost of making an item is $1.62 the cost of shipping it is $2.61 the cost of processing the transaction is $0.88 then finally, the cost of listing and selling it on a website is 13% of the total price. how do i mark the price up so that i make $1.00 per

Well we know that an item cost is 1.62+2.61+0.88
Now what does that all equal
It equals 5.11
Now what is 13% of 5.11
0.6643 is 13% of 5.11
Lets round that to 0.66
5.11+0.66=5.77
5.77 is the total price. That means you would need to make 6.77$ per item.

If you didnt round it would make it 5.7743 which means you would need to make 6.7743$ per item

Hope this helps