help with suspense account

Hi Mr John

The trial balance of Z failed to agree, the totals being: debit $836,200
credit $819,700
A suspense account was opened for the amount of the difference and the following errors were found
and corrected:
1 The totals of the cash discount columns in the cash book had not been posted to the discount
accounts. The figures were discount allowed $3,900 and discount received $5,100.
2 A cheque for $19,000 received from a customer was correctly entered in the cash book but was
posted to the control account as $9,100.
What will be the remaining balance on the suspense be after the correction of these errors?

Correct answer is $1,500 credit.

sir so the answer is:

1. Dr suspense 900
Cr sales 900
2. Dr suspense 9900
Cr receivable 9900
difference between debit and credit = 836200 – 824700 = 11500 DR

So shouldnt it be 11500 DR + DR Suspense 900 + DR suspense 9900 = 22300 DR??
why is the answer 1500 CR?