How many stereoisomers does 1-methyl-2-(prop-1-en-1-yl)cyclopropane have? (Include ring cis/trans isomers, enantiomers and E/Z isomers.)

C1 and C2 of the ring are stereocentres and the two ends differ (CH${}_3$ versus propenyl), so there is no symmetry: $2^2=4$ ring configurations. The propenyl C=C (CH${}_3$-CH=CH-) is stereogenic, giving E or Z. Total $4\times 2=8$ (verified by enumeration).