Answer
The product is 1,2-epoxycyclodecane. The product is cis.
Work Step by Step
Starting with the alkene and the peroxyacid, a one-step reaction gives the epoxide and the acid directly, without any intermediates.
The epoxide ring is formed where the double bond is, so on carbon 1 and 2. Since, the reactant was cis, the product is also cis.