Last year, a magazine charged a $50 subscription fee. This year, the

Last year, a magazine charged a $50 subscription fee. This year, the price will be increased by $10. If the magazine could lose 4 subscribers this year and still collect the same revenue as it did last year, how many subscribers did the magazine have last year? A. 20 B. 21 C. 22 D. 23 E. (…)