Got it to work doing this. Not sure how set you are in using a class to achieve this.
struct ContentView: View {
@State var var1: Int = 1
@State var var2: Int = 2
var body: some View {
@State var result = (var1 * 75) + (var2 * 75)
VStack {
TextField("#", value: $var1, formatter: NumberFormatter())
.padding()
TextField("#", value: $var2, formatter: NumberFormatter())
.padding()
Text("Result: \(result)")
.padding()
Spacer()
}
.padding()
}
}