A girl saves money over 200 weeks. She saves 5p in Week 1, 7p in Week 2, 9p in Week 3, and so on until Week 200. Her weekly savings form an arithmetic sequence. Find the amount she saves in Week 200. Calculate total savings over the 200 week period.

In part (a) the majority obtained 403 and some wrote their answer as £4.03, there was the usual crop of arithmetic errors with 2 ×199 = 298 or 498 being quite common. In part (b) the sum formula was usually quoted and used correctly but again arithmetic slips (e.g.408 ×100 = 4080 or 10 + 398 = 418 or 498) were often seen and some made errors with the units giving the answer as £40800. 

Selena S. 13 plus  Maths tutor, IB Maths tutor, 11 Plus Maths tutor, ...

1 year ago

Answered by Selena, an A Level Maths tutor with MyTutor

Still stuck? Get one-to-one help from a personally interviewed subject specialist


£22 /hr

Ruth N.

Degree: Economics (Bachelors) - Cambridge University

Subjects offered:Maths, Economics+ 2 more

-Personal Statements-
-Oxbridge Preparation-

“Economics Graduate from Cambridge, wanting to share my passion for the discipline”

PremiumGeorge B. GCSE Maths tutor, A Level Maths tutor, A Level Further Math...
£26 /hr

George B.

Degree: Mathematics (Masters) - Warwick University

Subjects offered:Maths, Further Mathematics + 1 more

Further Mathematics

“Premium tutor. First class graduate with teaching experience from a top Russell Group university. I deliver fun and relaxed lessons which achieve results!”

£20 /hr

Henrik S.

Degree: Physics and Philosophy (Integrated Masters) - Kings, London University

Subjects offered:Maths, Physics+ 3 more

Philosophy and Ethics
-Personal Statements-

“I will teach my tutees to become expert problem solvers so that they can adapt to the requirements of any future examination.”

MyTutor guarantee

|  2 completed tutorials

About the author

£20 /hr

Selena S.

Degree: Mathematics (Bachelors) - Imperial College London University

Subjects offered:Maths, Mandarin


“I am a patient and nice person who always would like to listen to students' ideas and find out what they don't understand. ”

MyTutor guarantee

You may also like...

Other A Level Maths questions

Find dy/dx of 5x^2 + 2y^3 +8 =17.

How do I integrate ln(x)

What is a Probability Mass Function (PMF)?

Find the equation of a straight line that passes through the coordinates (12,-10) and (5,4). Leaving your answer in the form y = mx + c

View A Level Maths tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss