Tom saves some money every week. He saves £3.20 in the first week, £3.40 in the second week, £3.60 in the third week, and so on until week 90. His weekly savings form an arithmetic sequence.
Find the amount he saves in week 90.
Calculate his total savings over the 90 week period.
326 exam-style questions on Edexcel A Level Maths Sequences and Series, covering 3.1 Arithmetic Sequences, 3.2 Arithmetic Series, 3.3 Geometric Sequences, 3.4 Geometric Series, 3.5 Sum to Infinity, 3.6 Sigma Notation, 3.7 Recurrence Relations, and 3.8 Modelling with Series. Each one has a worked solution and a mark scheme showing where the marks go.