函数/语法错误

Question

这些功能的目标最终是显示某人的咨询总费用，这取决于他们是否有低收入。假设函数向下流动以获得每个所需的值以便计算总数。我不明白如何修复我的代码中的各种错误，例如某些变量未在特定范围内声明，即使我认为我已正确声明它们。

#include <iostream>
using namespace std;

const double HighIncomeRate = .7;
const double LowIncomeRate = .4;

bool isLowIncome();

int main() {
  double Fee;
  double ConsultTime;

  cout << "Your fee is: " << getcalcFee(consultTime, Income) << endl;
  return 0;
}
bool isLowIncome() {
  double Income;

  cout << "What is your income: " << endl;
  cin >> Income;
  cout << "How long have you been consulted" << endl;
  cin >> ConsultTime;

  if (Income <= 25000) {
    return true;
  } else {
    return false;
  }
}
double calcFee(int &ConsultTime, const double HighIncomeRate,
               const double LowIncomeRate) {

  if (isLowIncome == true) {
    if (ConsultTime <= 30) {
      calcFee = 0
    } else {
      calcFee = LowIncomeRate * 50((ConsultTime - 30) / 60)
    }
  }
  if {
    if (ConsultTime <= 20) {
      calcFee = 0
    } else {
      calcFee = HighLowRate * 50((ConsultTime - 20) / 60)
    }
  }
  return 0;
}