FAQ: Properties and Access Control - Using Property Observers

This community-built FAQ covers the “Using Property Observers” exercise from the lesson “Properties and Access Control”.

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This exercise can be found in the following Codecademy content:

[BETA] Build iOS Apps with SwiftUI

FAQs on the exercise Using Property Observers

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Hey, I have a question. Seems like I’m the first one…
Im on number 8 and I don’t understand why the last function in this code doesn’t work and how to fix it.
I’m guessing it has something to do with the type of level of access. Though again, idk how to resolve this.

Error message:
SwiftBank.swift:28:26: error: instance member ‘finalDepositWithBonus’ cannot be used on type ‘SwiftBank’; did you mean to use a value of this type instead?
balance += SwiftBank.finalDepositWithBonus()
~~~~~~~~~ ^

struct SwiftBank {
  // password
  private let password : String
  // init
  init(password : String){
    self.password = password
  }
  // valid password?
  private func isValid(_ enteredPassword: String) -> Bool{
    if enteredPassword == password {
      return true
    } else {
      return false
    }
  }
  
  // balance
  private var balance: Double = 0
  // declare type property
  static let depositBonusRate: Double = 0.01
  // calculate total deposit amount
  private func finalDepositWithBonus(deposit: Double) -> Double {
   return deposit + (deposit * SwiftBank.depositBonusRate)
  }
  // Make Deposit
  mutating func makeDeposit(depositAmount: Double){
      balance += SwiftBank.finalDepositWithBonus()
  }
}