(1) decreased by 19% at one time, which was 8 1% of the original. 8 1% = (90%) 2, so every time the price is reduced 10%.

(2) Let the original price be X (yuan). Scheme ① charges (1-19%-5%) x-90 = 0.76x+90 (yuan). The charge for scheme ② (1- 19%-2%)x=0.79x (yuan). 3000 hours, scheme ① is economical; X & lt3000 hours, scheme ② is economical; When x=3000, the cost of the two schemes is equal.