For each order, a mail-order bookseller charges a fixed processing fee and an additional shipping fee for each book in

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For each order, a mail-order bookseller charges a fixed processing fee and an additional shipping fee for each book in the order. Rajeev placed five different orders with this bookseller - an order for 1 book in January, an order for 2 books in February, an order for 3 books in March, an order for 4 books in April, and an order for 5 books in May. What was the total of Rajeev's processing and the shipping fee for these five orders?

(1) Rajeev's processing and shipping fees were $1 more for his order in March than for his order in January.

(2) The total of Rajeev's shipping fees for the five orders was $7.50.

Answer: E

Source: GMAT Prep
Source: — Data Sufficiency |