Total surface area of toy $=$  Curved surface area of cone $+$  surface area of hemisphere

Curved  surface area of cone $=$ $prl$

Where $r=3.5cm$, Height $=15.5-3.5=12cm$

And hence, $l=12.5cm$       (by using formula $l^2=h^2+b^2$)

Therefore C.S.A. of cone $=p\times 3.5\times 12.5$

$=137.5c{m}^2$

Surface area of hemisphere $=2p{r}^2$

$=2\times p\times (3.5{)}^2$

$=77c{m}^2$

Hence T.S.A of toy $=77+137.5=214.5c{m}^2$