tip-app-calculator with pure javascript

In this project, i styled the Tip calculator to perform a calculation after having entered firstly the amount of Bill and selected the interest hike(select Percentage) secondly. The results obtained are correct whatever number of people i entered thirdly in the field matching.

But When a new calculation considering the same amount of Bill but a new Select Tip Percentage choosed , the result obtained is wrong. Because it is taking in account the previous select Tip rather than the new, to perform the desired calculation.

let's see the flow:

1/ 1st Move inputNumberBill(Yes) ------> selecTipChoosed(Yes) ------> inputNumberPeopleWhatever(Yes) ------> Result : **correct**

1/ 2nd Move peviousInputNumberBill(Yes) ------> newSelecTipChoosed(Yes) ------> inputNumberPeopleWhatever(Yes) ------> Result : **Wrong** <here is the issue faced>

Food in kettle

i want to improve the workflow of my tip calculator in a way that it could perform the second Move getting through the **right result** ( not to burnt foods)

Thanks you Guys ./