public void MoreThen100Test()
 {
     Assert.Equal(150, CatFoodStore.Price(100));
     Assert.Equal(151.5, CatFoodStore.Price(101));
     Assert.NotEqual(155, CatFoodStore.Price(101));
 }
 public void LessThen50Test()
 {
     Assert.Equal(4, CatFoodStore.Price(2));
     Assert.NotEqual(5, CatFoodStore.Price(2));
 }
 public void MoreThen50Test()
 {
     Assert.Equal(116.25, CatFoodStore.Price(75));
     Assert.NotEqual(150, CatFoodStore.Price(75));
 }