parseFloat doesn't work and returns as NaN React

Question

So, I'm trying to do some calculations from the field i have taken from an input:

const a = { 
price: '12',
qta: '2',
unit: '2',
total: '44' // I want to calculate this as * and put it here
}

So the problem is I'm taking as strings and I have to convert to number, I do use parseFloat for this as the following example:

 const unit = parseFloat(temp[_index_p].unit);
 const hours = parseFloat(temp[_index_p].hours);
 const price = parseFloat(temp[_index_p].price);
 const newTotal = unit * price + hours * price;
       temp[_index_p] = {
        ...temp[_index_p],
         [property]: value,
          total: newTotal,
         };
       }
 setData({ ...data, parts: temp });

So that code is called on edit and the problem is something doesn't work and returns `NaN and not the wanted value.

// Ignore the index part because I'm editing multipy object, but consider it as one single object