CA balance = (exports - imports) + net services + net primary income + net secondary income
KAFA balance = capital account + financial account
CA + KAFA = 0
KAFA balance = -60 (10-70), so we know CA balance has to equal +60
60 = (20 - 10) + 30 + 30 + NSY
60 = 70 + NSY
NSY = -10