(x+A) / (x+B)=0.88 where x is the number of additional acceptance,
B = total number of requests (pings)
A = total number of acceptance
in your case A = 60+ total number of passenger AND driver cancellations.
B = A / current AR (including decimals) = A/0.7
if you had ZERO passenger and driver cancellations, then solving for x:
0.12x = 0.88 x 60 /0.7 - 60
x = 129 (to nearest integer)
which means you need to accept 129 more jobs without rejecting a single ping, in reality, Im guessing he has had a few cancellations, which means he has to do MORE then 129 jobs before Sunday 1159pm (hahahahaha).

60 trips is trips completed, but no cancellations. In reality he will have some cancellations which make up his 70% AR. Meaning his total number of acceptance his higher and he will have to make up MORE to raise his AR back up to 88%.
As a side note this is the second time I've seen newbie rejecting too many jobs thinking can easily make back AR. How hard is it to remember the rule? (6 out 7 pings for GA, 8 out 9 for GPro?)
Thanks for equation man.
The link i shared is handy in the event that u dunno wats ur ping.
And im manually tracking igmore + canx count starting this week.