Answer:
If Ricardian neutrality holds true, after this change in the government's budget, private savings will equal 40.
Explanation:
S - I = X - M, where
S = Sp + Sg, where
Sp: private saving
Sg: Public saving = T - G
Sp + T - G - I = X - M
or,
Sp - I = (G - T) - (M - X) = Budget deficit - Trade deficit
Initially,
65 - 30 = 90 - 100 = - 10
When budget deficit falls to 50,
Sp - 90 = 50 - 100
Sp = - 50 + 90 = 40
Therefore, If Ricardian neutrality holds true, after this change in the government's budget, private savings will equal 40.