Silicon Ltd has issued a debenture whose par value is $1,000.$ The debenture can be redeemed at par after four years & could either be $990$ or $1,120$ based on the company$$s performance. The company has also the option to call back the debenture at a call back price of $1,050$ after two years upon shareholders$$ approach. The coupon rate of the debentures is $10\%$ p$.$a$.$ Required:

$$ Current yield based on each of the expected market prices

$$ Yield to maturity $($YTM$)$ based on each of the expected market prices

$$ Yield to call $($YTC$)$