minar inc reported the following results from last years operations

sales 5,700,000

variable expenses 3,510,000

contribution margin 2,190,000

fixed expenses 1,734,000

net operating income 456,000

average operating assets 3,000,000

at the beginning of this year the company has a 900,000 investment opportunity with the following characteristics

sales 1,530,000

contribution margin ration 60% of sales

fixed expenses 810,900

if the company purses the investment opportunity and other wise performs the same as last year the combines margin for the entire company will be closest to

6.3%

1.9%

7.8%

9.9%

I have no clue how to figure this out