Simple arithmetic

92 gasoline a week ago was 24.30 p., And yesterday 24.40 p.
A week ago, the course was 23.50 p. for $ 1, today for $ 1 give 26.20 p.
A week ago, 1 liter 92nd cost $ 24.30 / 23.50 = $ 1.03
Yesterday 1 l cost 24.40 / 26.20 = $ 0.93
Figase O_o
So we also fell! 10 US cents!
10 cents = 2.62 p.
...
Only now it is difficult to understand how he fell by 2.62 rubles in a week, if it went up by 10 kopecks?

UPD: Amendment in the calculations