Abikini and sunglasses cost 110 $ in total. the bikini costs 100 $ more than the glasses. how much do the sunglasses cost?

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).