$1.$ In the economy with marginal propensity of consumption at $0\mathrm{.}6$ and marginal propensity of demand for imports at $0\mathrm{.}4,$ the government considers an increase of spending by $100$bn liras. The share of tax revenues in GDP is $30\%.$ Government bonds are sold with the discount rate of $6\%.$

a$.$ What is the value of fiscal multiplier?

b$.$ What is the amount of public debt accumulation?

b$.$ What is the tax burden over periods $1($debt accumulation$)$ and $2($debt service$)?$