FA study hub question

Bob used the following balances to prepare his final accounts as at 30 April 20X7

Recervables
6.000
Bank loan
3,000
Bank overdraft
2,500
Drawings
4,100
Capital
12,500
Revenue
22000
Purchases
19200
Rent
5,400
Bank interest
825
Heat and light
4475

The business does not hold inventory No lurther adjustments were required

What is Bobs’ opening capital figure as at 1 May 20X77 ?
Study hub answer is 500.
My question 30 April 2007 closing capital is 12500.so the opening capital at 1 may 2007 should be 12500.But why study hub says the opening capital at 1 may 2007 is 500.i can’t understand the explanation.