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Three quantities R, S and T are such that R varies directly as S and inversely as the square of T. (a)Given that R= 480 when S=150 and T=5, write an equation connecting R,S and T (b)(i)Find the value of R when S=360 and T=1.5 (ii) Find the percentage change in R if S increases by 5% and T decreases by 20%.