How to solve...

Using data given in Question $2\mathrm{.}45,$ how many peaks would you expect to appear in the mass spectrum of lithium? If your mass spectrometer is a high$-$resolution instrument, at what mass would each of these peaks come? Estimate tr$/$e relative intensities of those peaks, assuming that the most abundant isotope is arbitrarily set to $100\%$ abund ance by the mass spectrometer.