Updated!
Your new Strength total would actually be at 81[8/10] since the update scale switches over to 10 TPE per attribute in the 81-90 range. So the first 4 TPE would get you from 79[1/5] to 80 and then the remaining 18 TPE would be worth 1[8/10] attribute points and get you up to 81[8/10].
Your new Strength total would actually be at 81[8/10] since the update scale switches over to 10 TPE per attribute in the 81-90 range. So the first 4 TPE would get you from 79[1/5] to 80 and then the remaining 18 TPE would be worth 1[8/10] attribute points and get you up to 81[8/10].