Reading 35 question 7, calculation of option premium 300, understand, especially, expression

mdfb79

Hi folks,
I am stuck with question seven in Reading 35, especially the calculation of the option premium gives me a hard time.
In the solution they calculate for the March 1.5 calls:
15,000,000/1,5 * 0,03=300,000 Dollar resulting in 300,000/1,5=200,000 pounds unsing the current spot rate.
I don’t understand the expression 15,000,000/1.5. Is the 1.5 the strike price? If yes, in the next calculation they should have used 1.55 and 1.6 strikes, but they haven’t.
Did anyone have the same question and already the answer?
Thanks for any answer and good luck to all!