How to count decimals in Angular?

Question

Angular

You need to calculate the amount and at the same time calculate it including VAT (16% and 18%), i.e. multiply it by 0.18 or by 0.16.
So far, it turns out to multiply only by an integer, but not by a fractional one. In this case, it is multiplied by 16, but not by 0.18:
codepen.io/rinatoptimus/pen/wadWqV
1) How to multiply by 0.18?
2) How to remove NaN in the place where the result appears?

Answer 1

Use not parseInt, but parseFloat in
codepen.io/anon/pen/qdmNoo filter

Answer 2

Excuse me, but could you tell me about the second point in the question?