[填空题]
On the first day of September, 2019, Gloria planted 5 f:qjcl/xa6is4l hx/yzun/:5x lowers i riuqm 21tr,q8n her garden. The number of flowers, which she plants at qurq2i mr 8t,1every 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= %
