Earned value problem

A project has $4$ tasks, namely, A$,$ B$,$ C$,$ and D$.$ A$,$ B$,$ and C have no predecessors. C is a predecessor to D$.$ As per the status date, A and B should have been completed $100\%.$ C should have been completed $75\%.$ Baseline cost for these task are: $A=20,B=15,C=30,$ and $D=20.$ Actual progress went as: $A=100\%$ finished at actual cost of $25$;$B=80\%$ at Actual cost of $10$;$C=50\%$ at actual cost of $20.$ Calculate CV$,$ SV$,\frac{C}{P}$I $,\frac{S}{P}$I $,$ baseline project duration, budget at completion, estimate at completion, and the new time estimate to complete the project. How has project done so far? The baseline estimate for project completion time is $20$ days.

Planned value $=20+15+22\mathrm{.}5=57\mathrm{.}5$

Actual cost $=25+10+20=55$

Earned value $=20+12+15=47$

$CV=EV-AC=47-55=-8$

$SV=EV-PV=47-57\mathrm{.}5=-10\mathrm{.}5$

$\frac{C}{P}$I $=E\frac{V}{A}C=\frac{47}{55}=\mathrm{.}85$

$\frac{S}{P}$I $=E\frac{V}{P}V=\frac{47}{57\mathrm{.}5}=\mathrm{.}82$

BAC$=85$

EAC$=\frac{85}{.}85=100$

Estimate to complete $=\frac{20}{.}82=24\mathrm{.}4$