```ts
export function hourRate(rate: number): number {
  return rate;
}

/** Pay for a week, with overtime beyond forty hours. */
export function weekPay(hours: number, rate: number): number {
  if (hours > 40) {
    return Math.floor((40 * hourRate(rate)) + ((hours - 40) * hourRate(rate) * 1.5));
  }
  return Math.floor(hours * hourRate(rate));
}
```