These are all day$-$count convention questions. Assume S$/$A bonds throughout with a principal of $$1,000$ and a rate per annum of $10\%.$

$1.$ Assume $30/360$ US$.$ What is the DCF between $1/1/2020$ and $3/13/2020?$

$2.$ Assume Actual$/$Actual ICMA. What is the DCF between $1/1/2020$ and $3/13/2020?$

$3.$ Assume now that $1/1/2020$ is a coupon reset date. What is the accrued interest

on the bond under $30/360$ US as of $3/13/2020?$

$4.$ Assume now that $1/1/2020$ is a coupon reset date. What is the accrued interest

on the bond under Actual$/$Actual ICMAas of $3/13/2020?$