Step-by-step explanation:7) Given petrol present price = 52. Old price = 1 Price INCREASED = 51 Increased % = 51 * = 5100%.8) 9 is 25% of 36.9) 75% of 20 is 1510) Selling price = Rs 250 Profit = 5 % Profit (%) = (SP-CP)/CP x 100 5 = (250-CP)/CP x 100 105CP = 25000 CP = Rs 23811)Simple interest=P×R×T/100p=6050r=6.5% p.at=3 yearsSimple interest=6050×6.5×3/100interest=1179.75 rupeestotal AMOUNT = interest+ principal amount = 6050+1179.75 = Rs 7229.7512)Simple interest=P×R×T/100p=7000r=3.5% p.at=2 yearsSimple interest=7000×3.5×2/100interest=490 rupeestotal amount = interest+ principal amount = 7000+490= Rs 749013)The cost of a book =Rs.275 Loss percent =15% Loss=Loss % of C.P =15% of Rs. 275 = 15×275/100=rs 41.25  Therefore, S.P =  C.P -  Loss =275−41.25=Rs.233.75 Hence, Amina sells a book for Rs. 233.7514) Simple Interest =Rs.45 Rate(R)=9% time(T)=1 yearSimple interest=P×R×T/10045=P×9×1/1004500=P*9500=PHence, she BORROWED Rs. 500here are all your answers pls mark me brainliest