If you start with 5ng of template dna. how much would you have
after 10 cycles?

5.12μg of DNA

Explanation:

PCR is a method use to amplify DNA. It often require primers ( short sequence) nucleotides, heat stable polymerase enzymes, and thermocycler.

DNA strands are double by every cycle of PCR and it denoted by the formula 2^n  where n is the number of  cycle.

starting with 5ng,

the amount after 10 cycles = 2¹⁰ × 5 ng = 5.12μg of DNA

the actual answer was 160934