Question

please tell me with explain

Answer 1

number of books sold in 2008 increases by 5800 from the number of books sold in 2007
so the number of books sold in 2008
=53290+5800
similarly,
number of books sold in 2009 increases by 5800 from the number of books sold in 2008
so the number of books sold in 2009
=53290+5800+5800
=64890

Answer 2

53290+5800 = 59090
the number of copies sold in 2009 is = 59090