Based on the rules provided by the Sale of Goods Act 1957 and case laws, advise the relevant parties in the following scenarios :

a) Ben sent his expensive Nicon DSLR camera to Jim's shop for a minor repair. After repairing it, without Ben's permission, Jim took the camera on a hiking trip and accidently dropped the camera. He thought that the camera is totally broken so he sold the camera to Zeke as scraps for RM50. Zeke spent RM600 to restore the camera to working order. Later, during a gathering among photographers, Ben noticed that Zeke is holding a familiar looking camera. Upon checking, it is confirmed that the camera was his so Ben demands it back but Zeke refused to hand it over. Explain to Zeke who the right owner of the camera is.

b) Lola is allergic to eggs, so she ordered and eggless chocolate cake for her birthday from specialty bakery. Upon eating the cake, she developed a bad case of rash. Lola discovered that although the cake itself contained no egg but the chocolate topping contains eggs. Lola wants to know whether she can sue the bakery under any implied term as provided by the Sale of Good Act 1957.