[填空题]
On the first day of Sept lpmzed1q8a :a588vtgembehbvs6rz ;tb1/r, 2019, Gloria planted 5 flowers in her garden. The number of flowers, which she plants;b1h/rv 6tzb s at every day of the month, forms an arithmetic sequence. The number of flowers she is going to plant in the last day of September is 63.
1.Find the common difference of the sequence.
d= .
2.Find the total number of flowers Gloria is going to plant during September.
$S_{30}$= .
3.Gloria estimated she would plant 1000 flowers in the month of September. Calculate the percentage error in Gloria's estimate.
ϵ= %
