1 day:1156-1152 = 4.
No.2:1159-1156 = 3
No.3:1163-1159 = 4
No.4:1165-1163 = 2
No.5:1172-1165 = 7
Therefore, the average daily electricity consumption is (4+3+4+2+7)/5=4.
July is 3 1 day, so the total electricity consumption is 4 * * * 3 1 = 124.
The power saving rate is (132-124)/132 = 6.06%.