Convert string in Array into number then adding them all up to get the total in JavaScript

Question

So I was able to "add" up all the string numbers but since they are string they just appear in the console side-by-side and obviously I can't actually add them up. How do I go about making them a number within my existing code?

let myStuff = [
  {
   "my_game":"PS4",
   "worth":"25.30"
  },
  {
   "my_cards":"pokemon",
   "worth":"10.50"
  },
]

const totalProfit = myStuff.reduce((cTotal, stuff) => {
   return stuff.worth + cTotal
}, 0);

console.log(totalProfit)

I just get this: 25.3010.50 but it should add all of the worth which would equate to 35.80

Tried looking around and tried .map(Number) to convert it but nothing works.