 
<translate> Loisa za ta biya jimillar $40 x 4 = $160 na watanni 4 na farko. Za ta biya jimillar $35 x 4 = $140 na watanni huɗu masu zuwa. Kuma za ta biya jimillar $30 x 4 = $120 na watanni huɗu da suka gabata. Saboda haka, za ta biya jimillar $ 100 + $ 160 + $ 140 + $ 120 = $520 na watanni 12 tare da biyan kuɗi. Saboda haka, Loisa za ta iya ajiye $520 - $450 = $70 idan ta sayi kwamfutar hannu da kuɗi. Saboda haka, amsar ita ce 70. <eng> Loisa will pay a total of $40 x 4 = $160 for the first 4 months. She will pay a total of $35 x 4 = $140 for the next four months. And she will pay a total of $30 x 4 = $120 for the last four months. Thus, she will pay a total of $100 + $160 + $140 + $120 = $520 for 12 months including the down payment. Therefore, Loisa can save $520 - $450 = $70 if she buys the tablet in cash.
Therefore, the answer is 70. 