Стрелял в тире, Дима в 76% случаев попал в мишень. Сколько промахов допустил Дима, если всего он произвел 50 выстрелов?

— Now, you’re interested in the job of a shop assistant. Have you ever worked as a shop assistant?
— Well, no. I’ve never actually worked as a shop assistant but I helped in a shop during my school holiday.
— Good, fine. Let’s have a look at these details you gave us. Well, what school did you go to?
— London High School.
— I see. What exams have you passed?
— English and Maths.
— Can you speak any foreign languages?
— Yes, French and German.
— What is your present job?
— I work as a receptionist in a small hotel.
— How long have you been working there?
— For six months. You see, I left school last year.
— Why do you want this job?
— Well, I like working with people and I think I can be useful to them.
— I see, what is your hobby?
— I like jogging and cycling.
— And what about your health? Do you smoke?
— No, I don’t smoke. I’ve got no major illnesses and I had no operations.

оветить на вопросы
1.Is Mary a pupil?
2.What school did she go to?
3.Can she speak any foreign languages?
4.Why is she interested in the job of a shop assistant?
5.What is Mary`s hobby?
6.Is she a healthy person? 

Помогите мне разобраться в процентах , вот таких % , а то я всё проболела в школе )!

1. Напишите понятие процента .

2. Решите с объяснением как это вычисляется :

  1% его равен 7

  50 % его равны 12,5

3. А как решаются такие примеры (тоже с объяснением) :

  1% от 245  

  1,5 % от 400

Буду вам заранее благодарна если поможите )