카타 8급 Transportation on vacation

C

unsigned rental_car_cost(unsigned d) {
  unsigned off = 0;
  if( d>=7 ) off=50;
  else if( d>=3 ) off=20;
  return d*40-off;
}

unsigned rental_car_cost(unsigned d) {
  return (d >= 7) ? (d*40)-50 : d >= 3 ? (d*40)-20 : d*40;
}